Definition of identity in English:

identity

nounPlural identities ʌɪˈdɛntɪtiˌaɪˈdɛn(t)ədi

1The fact of being who or what a person or thing is.
身份；本体
he knows the identity of the bombers
他知道投炸弹者的身份。
mass noun she believes she is the victim of mistaken identity
她确信自己是被认错身份的受害者。
Example sentencesExamples
- Like the films they screen, the festival has its own share of ‘real-life’ high drama and plots based on mistaken identities.
- It's a tangled skein of mistaken identities and ordinary people caught up in extraordinary situations; call it Brothers on a Train.
- It was a widely known fact that the identity of the five most powerful superhumans was a closely guarded secret.
- Costumes are in pastel shades and of Fifties vintage, witty in their matching detail for the tale of two sets of identical twins and multiple mistaken identities.
- In fact, her identity as a citizen in urban India is one that is minimally developed, if at all.
- I thought this would make people careful about concealing their true identities; in fact it led to more mayhem than I would have believed possible.
- Being one of the king's personal guests had given them a special status despite the fact that their identities had yet to be given.
- Mistaken identity, of course, has been the province of much postcolonial fiction.
- It doesn't matter that the joke is about mistaken identity or the fact that they're chasing the wrong vehicle - Atkinson can make you laugh at it anyway.
- All facts, including the identity of the killer, are assessed on the basis of a single criterion: the extent to which they serve their own cause.
- The only clue the police have to his identity is the fact that he appears to be a virtuoso stylophone player and only seems to be truly at ease when playing the magical instrument.
- ‘The very item of disguise meant to hide his identity has in fact given it away,’ he added.
- There is also corroborating evidence from Interpol the documents provided by the couple to verify their Kola identity are in fact false.
- NBC has revealed the identities of the 18 contestants that will compete on The Biggest Loser's fourth season.
- The homeless people, the mistaken identity, quite a few defenses at work here, and seeing what may or may not stick with this jury.
- What follows is a farrago of mistaken identities and gender reversals, a painful rip-off of Shakespeare in Love without any of the wit, charm or heart.
- The fact that the identity of the vessel was known at the time the Japanese forces were dispatched to hunt down the sub was revealed over the ensuing days.
- He initially gave a false name, but then revealed his true identity and the fact that he was banned from driving and had no insurance.
- The claimant has to prove not merely his own identity but also the fact of his parents' marriage.
- In fact the identity of these ‘planners’ is never sufficiently investigated.
Synonyms
name
specification
identification, recognition, naming, singling out, picking out, pinpointing, placing
discerning, distinguishing
North American informal fingering
1. 1.1 The characteristics determining who or what a person or thing is.
  身份；本体
  he wanted to develop a more distinctive Scottish Tory identity
  他想具有更为突出的苏格兰保守党人特征。
  Example sentencesExamples
  One could argue, in fact, that ethnic identity itself is a way of talking about access to resources.
  The assumption is that the European nations have superior monocultural identities which are threatened by dark hordes who will destroy the democratic heart of the continent.
  After nine decades, our national identity has changed dramatically.
  Many people - most, in fact - shape their identities as partners of lovers who become spouses and fellow-parents.
  Identities explores the relationship of racial, ethnic and national identities and power hierarchies within national and global arenas.
  Children thus formulate their identities in ways that make rural connections essential to both their ethnic and national identities as productive citizens.
  Understanding the myriad ways that Americans interacted with the world provides new insights into the construction of American literary and national identities.
  History has proven that such integration movements on the whole have given new strength to national identities.
  One commonly observed facet of the gay scene is that people often seek to define their very identities by the fact that they go to certain venues.
  That is, what about people who deliberately disrupt the continuity that ordinarily characterizes our identity?
  However, the fact that some tribal identities do not survive into later centuries underlines the political volatility of the period.
  There are ‘diasporas’ of all national and ethnic identities in most countries which have had substantial levels of immigration.
  My appreciation of this country stems from the fact that our national identity is impossible to pin down.
  So, when you get involved into the European community your sense of your own national identity is enhanced in fact.
  What should be one of the most important facts of our national identity is instead one of the government's most closely guarded secrets!
  Multiculturalism is a political ideology that has completely altered the demographic identity of this nation.
  All over the world, youth are participating in movements against the same systems of power that threaten to manipulate the economic and social identities of whole nations.
  For decades, the national identity represented a progressive Utopia in her eyes.
  Each stage in this progression apparently moves him from the status of hero to that of outcast, but in fact both identities are implicated in him from the very start.
  The modern state mediates national, sexual and ethnic identities in the public sphere.
  Synonyms
  individuality, self, selfhood, ego, personality, character, originality, distinctiveness, distinction, singularity, peculiarity, uniqueness, differentness
2. 1.2as modifier (of an object) serving to establish who the holder, owner, or wearer is by bearing their name and often other details such as a signature or photograph.
  （物件）能证明持有者身份的
  an identity card
  身份证。
  Example sentencesExamples
  Several of the suspects are Jerusalem residents who carry Israeli identity cards that allow them free movement, security officials said.
  Thereafter, only those with identity cards should be allowed to stay.
  Bookings should be in name via the identity card and/or passport, to short circuit the ticket scalps.
  When the worried monks called the police, they found that the two fraudsters had presented fake identity cards, fake addresses, and a fake account number.
  Before giving the go-ahead for identity cards, we should be offered a properly-reasoned case and an opportunity of airing all points of view.
  It is introducing identity cards, restricting immigration, seeking to curb the right of habeas corpus and extending antisocial behaviour orders.
  All candidates were expected to have identity cards bearing their photographs to prevent other people sitting examinations for them.
  They have not been provided with identity cards because they are regarded as illegitimate residents by the local administration.
  Authoritarian measures like the introduction of costly and unworkable identity cards show that Labour have tipped the balance between freedom and control too far the wrong way.
  Mexican officials are giving Mexican government IDs to illegal aliens in this country to be used as identity cards.
  The law states that photographs on Italian identity cards must show a person's features clearly.
  Registered health workers always carry identity badges with their photographs displayed.
  Tickets issued at student fares are only valid for travel in conjunction with a valid student identity card bearing a photograph of the holder.
  Parents and children do not fully understand the privacy and civil rights issues that are being eroded by this back door introduction of teenage identity cards.
  The man disappeared after a prospective client from Kasama Drug Store challenged him to reveal his real name and identity card.
  Young people across South Lakeland and Furness are being encouraged by police to carry photograph identity cards to prove their age.
  As they collect passes and identity cards required to enter the counting booth, he pulls up those who are late and pulls the legs of his younger followers.
  The administration is now drafting a population bill to curb urbanization and to expel poor migrants who do not have Jakarta identity cards.
  College managers are insisting that students and staff wear photographic identity cards on colour coded ribbons visible at all times to security guards.
  The code also requires contractors to be in uniform or be easily identifiable and carry identity cards with their photograph.
2A close similarity or affinity.
同一性；一致
an identity between the company's own interests and those of the local community
Example sentencesExamples
- There is a close identity between Celtic FC and Roman Catholicism, and also between Rangers FC and Scottish cultural Protestantism.
- Westmorland claims a close identity with aviation pioneering, the jubilee of which is being celebrated this week.
- It discusses the identities and similarities between OXYB and the yeast Osh proteins.
- In the present case the Inspector had based his earlier conclusion on the close identity between the Company and the Second Respondent.
Synonyms
identicalness, sameness, selfsameness, oneness, congruity, congruence, indistinguishability, interchangeability
likeness, alikeness, uniformity, similarity, closeness, accordance, alignment, parallelism, symmetry
3Mathematics
A transformation that leaves an object unchanged.
〔数〕恒等运算
Example sentencesExamples
- The table gives the result of all possible pairwise combinations of the four operations I, R, P and Y (which stand for the identity operation and for 180-degree rotations around the roll, pitch and yaw axes).
- Any object, indeed any molecule, will contain at least one of these symmetry elements - the operation C 1 known as the identity operation - a rotation of 360°, the equivalent of doing nothing.
1. 3.1 An element of a set which, if combined with another element by a specified binary operation, leaves that element unchanged.
  单位元素，幺元
  Example sentencesExamples
  For example, the collection of integers under addition is a group (the identity element is 0), and groups occur throughout mathematics from geometry to combinatorics to cryptography.
  When you use an operation to combine an identity with another number, that number stays the same.
  First, among the operations there must be an identity element - an operation that leaves the system unchanged.
  The Lie algebra as a vector space can be identified with the tangent space at the identity element of the group.
  Group theory studies not a single structure, but a type of structure, the pattern common to collections of objects with a binary operation, an identity element thereon, and inverses for each element.
4Mathematics
The equality of two expressions for all values of the quantities expressed by letters, or an equation expressing this, e.g. (x + 1)² = x² + 2x + 1.
〔数〕恒等（式）（如（ x + 1）²= x ²+ 2 x + 1）
Example sentencesExamples
- Identity and equality are two fundamental binary relations which relate expressions of a given type.

Origin

Late 16th century (in the sense 'quality of being identical'): from late Latin identitas, from Latin idem 'same'.

Rhymes

entity

Definition of identity in US English:

identity

nounˌīˈden(t)ədēˌaɪˈdɛn(t)ədi

1The fact of being who or what a person or thing is.
身份；本体
he knows the identity of the bombers
他知道投炸弹者的身份。
she believes she is the victim of mistaken identity
她确信自己是被认错身份的受害者。
Example sentencesExamples
- NBC has revealed the identities of the 18 contestants that will compete on The Biggest Loser's fourth season.
- Like the films they screen, the festival has its own share of ‘real-life’ high drama and plots based on mistaken identities.
- Costumes are in pastel shades and of Fifties vintage, witty in their matching detail for the tale of two sets of identical twins and multiple mistaken identities.
- There is also corroborating evidence from Interpol the documents provided by the couple to verify their Kola identity are in fact false.
- The fact that the identity of the vessel was known at the time the Japanese forces were dispatched to hunt down the sub was revealed over the ensuing days.
- He initially gave a false name, but then revealed his true identity and the fact that he was banned from driving and had no insurance.
- The only clue the police have to his identity is the fact that he appears to be a virtuoso stylophone player and only seems to be truly at ease when playing the magical instrument.
- The claimant has to prove not merely his own identity but also the fact of his parents' marriage.
- It doesn't matter that the joke is about mistaken identity or the fact that they're chasing the wrong vehicle - Atkinson can make you laugh at it anyway.
- Mistaken identity, of course, has been the province of much postcolonial fiction.
- The homeless people, the mistaken identity, quite a few defenses at work here, and seeing what may or may not stick with this jury.
- I thought this would make people careful about concealing their true identities; in fact it led to more mayhem than I would have believed possible.
- It was a widely known fact that the identity of the five most powerful superhumans was a closely guarded secret.
- It's a tangled skein of mistaken identities and ordinary people caught up in extraordinary situations; call it Brothers on a Train.
- Being one of the king's personal guests had given them a special status despite the fact that their identities had yet to be given.
- ‘The very item of disguise meant to hide his identity has in fact given it away,’ he added.
- All facts, including the identity of the killer, are assessed on the basis of a single criterion: the extent to which they serve their own cause.
- In fact the identity of these ‘planners’ is never sufficiently investigated.
- What follows is a farrago of mistaken identities and gender reversals, a painful rip-off of Shakespeare in Love without any of the wit, charm or heart.
- In fact, her identity as a citizen in urban India is one that is minimally developed, if at all.
Synonyms
name
identification, recognition, naming, singling out, picking out, pinpointing, placing
1. 1.1 The characteristics determining who or what a person or thing is.
  身份；本体
  attempts to define a distinct Canadian identity
  Example sentencesExamples
  Each stage in this progression apparently moves him from the status of hero to that of outcast, but in fact both identities are implicated in him from the very start.
  Multiculturalism is a political ideology that has completely altered the demographic identity of this nation.
  After nine decades, our national identity has changed dramatically.
  There are ‘diasporas’ of all national and ethnic identities in most countries which have had substantial levels of immigration.
  All over the world, youth are participating in movements against the same systems of power that threaten to manipulate the economic and social identities of whole nations.
  History has proven that such integration movements on the whole have given new strength to national identities.
  The modern state mediates national, sexual and ethnic identities in the public sphere.
  So, when you get involved into the European community your sense of your own national identity is enhanced in fact.
  Many people - most, in fact - shape their identities as partners of lovers who become spouses and fellow-parents.
  That is, what about people who deliberately disrupt the continuity that ordinarily characterizes our identity?
  My appreciation of this country stems from the fact that our national identity is impossible to pin down.
  For decades, the national identity represented a progressive Utopia in her eyes.
  Children thus formulate their identities in ways that make rural connections essential to both their ethnic and national identities as productive citizens.
  One commonly observed facet of the gay scene is that people often seek to define their very identities by the fact that they go to certain venues.
  What should be one of the most important facts of our national identity is instead one of the government's most closely guarded secrets!
  One could argue, in fact, that ethnic identity itself is a way of talking about access to resources.
  However, the fact that some tribal identities do not survive into later centuries underlines the political volatility of the period.
  Identities explores the relationship of racial, ethnic and national identities and power hierarchies within national and global arenas.
  The assumption is that the European nations have superior monocultural identities which are threatened by dark hordes who will destroy the democratic heart of the continent.
  Understanding the myriad ways that Americans interacted with the world provides new insights into the construction of American literary and national identities.
  Synonyms
  individuality, self, selfhood, ego, personality, character, originality, distinctiveness, distinction, singularity, peculiarity, uniqueness, differentness
2. 1.2as modifier (of an object) serving to establish who the holder, owner, or wearer is by bearing their name and often other details such as a signature or photograph.
  （物件）能证明持有者身份的
  an identity card
  身份证。
  Example sentencesExamples
  Mexican officials are giving Mexican government IDs to illegal aliens in this country to be used as identity cards.
  College managers are insisting that students and staff wear photographic identity cards on colour coded ribbons visible at all times to security guards.
  When the worried monks called the police, they found that the two fraudsters had presented fake identity cards, fake addresses, and a fake account number.
  They have not been provided with identity cards because they are regarded as illegitimate residents by the local administration.
  Parents and children do not fully understand the privacy and civil rights issues that are being eroded by this back door introduction of teenage identity cards.
  The administration is now drafting a population bill to curb urbanization and to expel poor migrants who do not have Jakarta identity cards.
  Bookings should be in name via the identity card and/or passport, to short circuit the ticket scalps.
  The man disappeared after a prospective client from Kasama Drug Store challenged him to reveal his real name and identity card.
  Several of the suspects are Jerusalem residents who carry Israeli identity cards that allow them free movement, security officials said.
  The law states that photographs on Italian identity cards must show a person's features clearly.
  Thereafter, only those with identity cards should be allowed to stay.
  It is introducing identity cards, restricting immigration, seeking to curb the right of habeas corpus and extending antisocial behaviour orders.
  As they collect passes and identity cards required to enter the counting booth, he pulls up those who are late and pulls the legs of his younger followers.
  Young people across South Lakeland and Furness are being encouraged by police to carry photograph identity cards to prove their age.
  Tickets issued at student fares are only valid for travel in conjunction with a valid student identity card bearing a photograph of the holder.
  The code also requires contractors to be in uniform or be easily identifiable and carry identity cards with their photograph.
  All candidates were expected to have identity cards bearing their photographs to prevent other people sitting examinations for them.
  Authoritarian measures like the introduction of costly and unworkable identity cards show that Labour have tipped the balance between freedom and control too far the wrong way.
  Before giving the go-ahead for identity cards, we should be offered a properly-reasoned case and an opportunity of airing all points of view.
  Registered health workers always carry identity badges with their photographs displayed.
2A close similarity or affinity.
同一性；一致
the initiative created an identity between the city and the suburbs
这一倡议使伦敦城与执政精英之间达成了一致。
Example sentencesExamples
- It discusses the identities and similarities between OXYB and the yeast Osh proteins.
- There is a close identity between Celtic FC and Roman Catholicism, and also between Rangers FC and Scottish cultural Protestantism.
- Westmorland claims a close identity with aviation pioneering, the jubilee of which is being celebrated this week.
- In the present case the Inspector had based his earlier conclusion on the close identity between the Company and the Second Respondent.
Synonyms
identicalness, sameness, selfsameness, oneness, congruity, congruence, indistinguishability, interchangeability
3Mathematics
A transformation that leaves an object unchanged.
〔数〕恒等运算
Example sentencesExamples
- Any object, indeed any molecule, will contain at least one of these symmetry elements - the operation C 1 known as the identity operation - a rotation of 360°, the equivalent of doing nothing.
- The table gives the result of all possible pairwise combinations of the four operations I, R, P and Y (which stand for the identity operation and for 180-degree rotations around the roll, pitch and yaw axes).
1. 3.1 An element of a set which, if combined with another element by a specified binary operation, leaves that element unchanged.
  单位元素，幺元
  Example sentencesExamples
  First, among the operations there must be an identity element - an operation that leaves the system unchanged.
  Group theory studies not a single structure, but a type of structure, the pattern common to collections of objects with a binary operation, an identity element thereon, and inverses for each element.
  When you use an operation to combine an identity with another number, that number stays the same.
  The Lie algebra as a vector space can be identified with the tangent space at the identity element of the group.
  For example, the collection of integers under addition is a group (the identity element is 0), and groups occur throughout mathematics from geometry to combinatorics to cryptography.
4Mathematics
The equality of two expressions for all values of the quantities expressed by letters, or an equation expressing this, e.g. (x + 1)² = x² + 2x + 1.
〔数〕恒等（式）（如（ x + 1）²= x ²+ 2 x + 1）
Example sentencesExamples
- Identity and equality are two fundamental binary relations which relate expressions of a given type.

Origin

Late 16th century (in the sense ‘quality of being identical’): from late Latin identitas, from Latin idem ‘same’.

单词	identity
释义	Definition of identity in English: identity nounPlural identities ʌɪˈdɛntɪtiˌaɪˈdɛn(t)ədi 1The fact of being who or what a person or thing is. 身份；本体 he knows the identity of the bombers 他知道投炸弹者的身份。 mass noun she believes she is the victim of mistaken identity 她确信自己是被认错身份的受害者。 Example sentencesExamples Like the films they screen, the festival has its own share of ‘real-life’ high drama and plots based on mistaken identities. It's a tangled skein of mistaken identities and ordinary people caught up in extraordinary situations; call it Brothers on a Train. It was a widely known fact that the identity of the five most powerful superhumans was a closely guarded secret. Costumes are in pastel shades and of Fifties vintage, witty in their matching detail for the tale of two sets of identical twins and multiple mistaken identities. In fact, her identity as a citizen in urban India is one that is minimally developed, if at all. I thought this would make people careful about concealing their true identities; in fact it led to more mayhem than I would have believed possible. Being one of the king's personal guests had given them a special status despite the fact that their identities had yet to be given. Mistaken identity, of course, has been the province of much postcolonial fiction. It doesn't matter that the joke is about mistaken identity or the fact that they're chasing the wrong vehicle - Atkinson can make you laugh at it anyway. All facts, including the identity of the killer, are assessed on the basis of a single criterion: the extent to which they serve their own cause. The only clue the police have to his identity is the fact that he appears to be a virtuoso stylophone player and only seems to be truly at ease when playing the magical instrument. ‘The very item of disguise meant to hide his identity has in fact given it away,’ he added. There is also corroborating evidence from Interpol the documents provided by the couple to verify their Kola identity are in fact false. NBC has revealed the identities of the 18 contestants that will compete on The Biggest Loser's fourth season. The homeless people, the mistaken identity, quite a few defenses at work here, and seeing what may or may not stick with this jury. What follows is a farrago of mistaken identities and gender reversals, a painful rip-off of Shakespeare in Love without any of the wit, charm or heart. The fact that the identity of the vessel was known at the time the Japanese forces were dispatched to hunt down the sub was revealed over the ensuing days. He initially gave a false name, but then revealed his true identity and the fact that he was banned from driving and had no insurance. The claimant has to prove not merely his own identity but also the fact of his parents' marriage. In fact the identity of these ‘planners’ is never sufficiently investigated. Synonyms name specification identification, recognition, naming, singling out, picking out, pinpointing, placing discerning, distinguishing North American informal fingering 1.1 The characteristics determining who or what a person or thing is. 身份；本体 he wanted to develop a more distinctive Scottish Tory identity 他想具有更为突出的苏格兰保守党人特征。 Example sentencesExamples One could argue, in fact, that ethnic identity itself is a way of talking about access to resources. The assumption is that the European nations have superior monocultural identities which are threatened by dark hordes who will destroy the democratic heart of the continent. After nine decades, our national identity has changed dramatically. Many people - most, in fact - shape their identities as partners of lovers who become spouses and fellow-parents. Identities explores the relationship of racial, ethnic and national identities and power hierarchies within national and global arenas. Children thus formulate their identities in ways that make rural connections essential to both their ethnic and national identities as productive citizens. Understanding the myriad ways that Americans interacted with the world provides new insights into the construction of American literary and national identities. History has proven that such integration movements on the whole have given new strength to national identities. One commonly observed facet of the gay scene is that people often seek to define their very identities by the fact that they go to certain venues. That is, what about people who deliberately disrupt the continuity that ordinarily characterizes our identity? However, the fact that some tribal identities do not survive into later centuries underlines the political volatility of the period. There are ‘diasporas’ of all national and ethnic identities in most countries which have had substantial levels of immigration. My appreciation of this country stems from the fact that our national identity is impossible to pin down. So, when you get involved into the European community your sense of your own national identity is enhanced in fact. What should be one of the most important facts of our national identity is instead one of the government's most closely guarded secrets! Multiculturalism is a political ideology that has completely altered the demographic identity of this nation. All over the world, youth are participating in movements against the same systems of power that threaten to manipulate the economic and social identities of whole nations. For decades, the national identity represented a progressive Utopia in her eyes. Each stage in this progression apparently moves him from the status of hero to that of outcast, but in fact both identities are implicated in him from the very start. The modern state mediates national, sexual and ethnic identities in the public sphere. Synonyms individuality, self, selfhood, ego, personality, character, originality, distinctiveness, distinction, singularity, peculiarity, uniqueness, differentness 1.2as modifier (of an object) serving to establish who the holder, owner, or wearer is by bearing their name and often other details such as a signature or photograph. （物件）能证明持有者身份的 an identity card 身份证。 Example sentencesExamples Several of the suspects are Jerusalem residents who carry Israeli identity cards that allow them free movement, security officials said. Thereafter, only those with identity cards should be allowed to stay. Bookings should be in name via the identity card and/or passport, to short circuit the ticket scalps. When the worried monks called the police, they found that the two fraudsters had presented fake identity cards, fake addresses, and a fake account number. Before giving the go-ahead for identity cards, we should be offered a properly-reasoned case and an opportunity of airing all points of view. It is introducing identity cards, restricting immigration, seeking to curb the right of habeas corpus and extending antisocial behaviour orders. All candidates were expected to have identity cards bearing their photographs to prevent other people sitting examinations for them. They have not been provided with identity cards because they are regarded as illegitimate residents by the local administration. Authoritarian measures like the introduction of costly and unworkable identity cards show that Labour have tipped the balance between freedom and control too far the wrong way. Mexican officials are giving Mexican government IDs to illegal aliens in this country to be used as identity cards. The law states that photographs on Italian identity cards must show a person's features clearly. Registered health workers always carry identity badges with their photographs displayed. Tickets issued at student fares are only valid for travel in conjunction with a valid student identity card bearing a photograph of the holder. Parents and children do not fully understand the privacy and civil rights issues that are being eroded by this back door introduction of teenage identity cards. The man disappeared after a prospective client from Kasama Drug Store challenged him to reveal his real name and identity card. Young people across South Lakeland and Furness are being encouraged by police to carry photograph identity cards to prove their age. As they collect passes and identity cards required to enter the counting booth, he pulls up those who are late and pulls the legs of his younger followers. The administration is now drafting a population bill to curb urbanization and to expel poor migrants who do not have Jakarta identity cards. College managers are insisting that students and staff wear photographic identity cards on colour coded ribbons visible at all times to security guards. The code also requires contractors to be in uniform or be easily identifiable and carry identity cards with their photograph. 2A close similarity or affinity. 同一性；一致 an identity between the company's own interests and those of the local community Example sentencesExamples There is a close identity between Celtic FC and Roman Catholicism, and also between Rangers FC and Scottish cultural Protestantism. Westmorland claims a close identity with aviation pioneering, the jubilee of which is being celebrated this week. It discusses the identities and similarities between OXYB and the yeast Osh proteins. In the present case the Inspector had based his earlier conclusion on the close identity between the Company and the Second Respondent. Synonyms identicalness, sameness, selfsameness, oneness, congruity, congruence, indistinguishability, interchangeability likeness, alikeness, uniformity, similarity, closeness, accordance, alignment, parallelism, symmetry 3Mathematics A transformation that leaves an object unchanged. 〔数〕恒等运算 Example sentencesExamples The table gives the result of all possible pairwise combinations of the four operations I, R, P and Y (which stand for the identity operation and for 180-degree rotations around the roll, pitch and yaw axes). Any object, indeed any molecule, will contain at least one of these symmetry elements - the operation C 1 known as the identity operation - a rotation of 360°, the equivalent of doing nothing. 3.1 An element of a set which, if combined with another element by a specified binary operation, leaves that element unchanged. 单位元素，幺元 Example sentencesExamples For example, the collection of integers under addition is a group (the identity element is 0), and groups occur throughout mathematics from geometry to combinatorics to cryptography. When you use an operation to combine an identity with another number, that number stays the same. First, among the operations there must be an identity element - an operation that leaves the system unchanged. The Lie algebra as a vector space can be identified with the tangent space at the identity element of the group. Group theory studies not a single structure, but a type of structure, the pattern common to collections of objects with a binary operation, an identity element thereon, and inverses for each element. 4Mathematics The equality of two expressions for all values of the quantities expressed by letters, or an equation expressing this, e.g. (x + 1)² = x² + 2x + 1. 〔数〕恒等（式）（如（ x + 1）²= x ²+ 2 x + 1） Example sentencesExamples Identity and equality are two fundamental binary relations which relate expressions of a given type. Origin Late 16th century (in the sense 'quality of being identical'): from late Latin identitas, from Latin idem 'same'. Rhymes entity Definition of identity in US English: identity nounˌīˈden(t)ədēˌaɪˈdɛn(t)ədi 1The fact of being who or what a person or thing is. 身份；本体 he knows the identity of the bombers 他知道投炸弹者的身份。 she believes she is the victim of mistaken identity 她确信自己是被认错身份的受害者。 Example sentencesExamples NBC has revealed the identities of the 18 contestants that will compete on The Biggest Loser's fourth season. Like the films they screen, the festival has its own share of ‘real-life’ high drama and plots based on mistaken identities. Costumes are in pastel shades and of Fifties vintage, witty in their matching detail for the tale of two sets of identical twins and multiple mistaken identities. There is also corroborating evidence from Interpol the documents provided by the couple to verify their Kola identity are in fact false. The fact that the identity of the vessel was known at the time the Japanese forces were dispatched to hunt down the sub was revealed over the ensuing days. He initially gave a false name, but then revealed his true identity and the fact that he was banned from driving and had no insurance. The only clue the police have to his identity is the fact that he appears to be a virtuoso stylophone player and only seems to be truly at ease when playing the magical instrument. The claimant has to prove not merely his own identity but also the fact of his parents' marriage. It doesn't matter that the joke is about mistaken identity or the fact that they're chasing the wrong vehicle - Atkinson can make you laugh at it anyway. Mistaken identity, of course, has been the province of much postcolonial fiction. The homeless people, the mistaken identity, quite a few defenses at work here, and seeing what may or may not stick with this jury. I thought this would make people careful about concealing their true identities; in fact it led to more mayhem than I would have believed possible. It was a widely known fact that the identity of the five most powerful superhumans was a closely guarded secret. It's a tangled skein of mistaken identities and ordinary people caught up in extraordinary situations; call it Brothers on a Train. Being one of the king's personal guests had given them a special status despite the fact that their identities had yet to be given. ‘The very item of disguise meant to hide his identity has in fact given it away,’ he added. All facts, including the identity of the killer, are assessed on the basis of a single criterion: the extent to which they serve their own cause. In fact the identity of these ‘planners’ is never sufficiently investigated. What follows is a farrago of mistaken identities and gender reversals, a painful rip-off of Shakespeare in Love without any of the wit, charm or heart. In fact, her identity as a citizen in urban India is one that is minimally developed, if at all. Synonyms name identification, recognition, naming, singling out, picking out, pinpointing, placing 1.1 The characteristics determining who or what a person or thing is. 身份；本体 attempts to define a distinct Canadian identity Example sentencesExamples Each stage in this progression apparently moves him from the status of hero to that of outcast, but in fact both identities are implicated in him from the very start. Multiculturalism is a political ideology that has completely altered the demographic identity of this nation. After nine decades, our national identity has changed dramatically. There are ‘diasporas’ of all national and ethnic identities in most countries which have had substantial levels of immigration. All over the world, youth are participating in movements against the same systems of power that threaten to manipulate the economic and social identities of whole nations. History has proven that such integration movements on the whole have given new strength to national identities. The modern state mediates national, sexual and ethnic identities in the public sphere. So, when you get involved into the European community your sense of your own national identity is enhanced in fact. Many people - most, in fact - shape their identities as partners of lovers who become spouses and fellow-parents. That is, what about people who deliberately disrupt the continuity that ordinarily characterizes our identity? My appreciation of this country stems from the fact that our national identity is impossible to pin down. For decades, the national identity represented a progressive Utopia in her eyes. Children thus formulate their identities in ways that make rural connections essential to both their ethnic and national identities as productive citizens. One commonly observed facet of the gay scene is that people often seek to define their very identities by the fact that they go to certain venues. What should be one of the most important facts of our national identity is instead one of the government's most closely guarded secrets! One could argue, in fact, that ethnic identity itself is a way of talking about access to resources. However, the fact that some tribal identities do not survive into later centuries underlines the political volatility of the period. Identities explores the relationship of racial, ethnic and national identities and power hierarchies within national and global arenas. The assumption is that the European nations have superior monocultural identities which are threatened by dark hordes who will destroy the democratic heart of the continent. Understanding the myriad ways that Americans interacted with the world provides new insights into the construction of American literary and national identities. Synonyms individuality, self, selfhood, ego, personality, character, originality, distinctiveness, distinction, singularity, peculiarity, uniqueness, differentness 1.2as modifier (of an object) serving to establish who the holder, owner, or wearer is by bearing their name and often other details such as a signature or photograph. （物件）能证明持有者身份的 an identity card 身份证。 Example sentencesExamples Mexican officials are giving Mexican government IDs to illegal aliens in this country to be used as identity cards. College managers are insisting that students and staff wear photographic identity cards on colour coded ribbons visible at all times to security guards. When the worried monks called the police, they found that the two fraudsters had presented fake identity cards, fake addresses, and a fake account number. They have not been provided with identity cards because they are regarded as illegitimate residents by the local administration. Parents and children do not fully understand the privacy and civil rights issues that are being eroded by this back door introduction of teenage identity cards. The administration is now drafting a population bill to curb urbanization and to expel poor migrants who do not have Jakarta identity cards. Bookings should be in name via the identity card and/or passport, to short circuit the ticket scalps. The man disappeared after a prospective client from Kasama Drug Store challenged him to reveal his real name and identity card. Several of the suspects are Jerusalem residents who carry Israeli identity cards that allow them free movement, security officials said. The law states that photographs on Italian identity cards must show a person's features clearly. Thereafter, only those with identity cards should be allowed to stay. It is introducing identity cards, restricting immigration, seeking to curb the right of habeas corpus and extending antisocial behaviour orders. As they collect passes and identity cards required to enter the counting booth, he pulls up those who are late and pulls the legs of his younger followers. Young people across South Lakeland and Furness are being encouraged by police to carry photograph identity cards to prove their age. Tickets issued at student fares are only valid for travel in conjunction with a valid student identity card bearing a photograph of the holder. The code also requires contractors to be in uniform or be easily identifiable and carry identity cards with their photograph. All candidates were expected to have identity cards bearing their photographs to prevent other people sitting examinations for them. Authoritarian measures like the introduction of costly and unworkable identity cards show that Labour have tipped the balance between freedom and control too far the wrong way. Before giving the go-ahead for identity cards, we should be offered a properly-reasoned case and an opportunity of airing all points of view. Registered health workers always carry identity badges with their photographs displayed. 2A close similarity or affinity. 同一性；一致 the initiative created an identity between the city and the suburbs 这一倡议使伦敦城与执政精英之间达成了一致。 Example sentencesExamples It discusses the identities and similarities between OXYB and the yeast Osh proteins. There is a close identity between Celtic FC and Roman Catholicism, and also between Rangers FC and Scottish cultural Protestantism. Westmorland claims a close identity with aviation pioneering, the jubilee of which is being celebrated this week. In the present case the Inspector had based his earlier conclusion on the close identity between the Company and the Second Respondent. Synonyms identicalness, sameness, selfsameness, oneness, congruity, congruence, indistinguishability, interchangeability 3Mathematics A transformation that leaves an object unchanged. 〔数〕恒等运算 Example sentencesExamples Any object, indeed any molecule, will contain at least one of these symmetry elements - the operation C 1 known as the identity operation - a rotation of 360°, the equivalent of doing nothing. The table gives the result of all possible pairwise combinations of the four operations I, R, P and Y (which stand for the identity operation and for 180-degree rotations around the roll, pitch and yaw axes). 3.1 An element of a set which, if combined with another element by a specified binary operation, leaves that element unchanged. 单位元素，幺元 Example sentencesExamples First, among the operations there must be an identity element - an operation that leaves the system unchanged. Group theory studies not a single structure, but a type of structure, the pattern common to collections of objects with a binary operation, an identity element thereon, and inverses for each element. When you use an operation to combine an identity with another number, that number stays the same. The Lie algebra as a vector space can be identified with the tangent space at the identity element of the group. For example, the collection of integers under addition is a group (the identity element is 0), and groups occur throughout mathematics from geometry to combinatorics to cryptography. 4Mathematics The equality of two expressions for all values of the quantities expressed by letters, or an equation expressing this, e.g. (x + 1)² = x² + 2x + 1. 〔数〕恒等（式）（如（ x + 1）²= x ²+ 2 x + 1） Example sentencesExamples Identity and equality are two fundamental binary relations which relate expressions of a given type. Origin Late 16th century (in the sense ‘quality of being identical’): from late Latin identitas, from Latin idem ‘same’.
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