1The quality of being made up of exactly similar parts facing each other or around an axis.

这个系列在中间有一条对称线。

六边对称的结晶体。

1. 1.1 Correct or pleasing proportion of the parts of a thing.
   匀称
   the overall symmetry makes the poem pleasant to the ear

   使这首诗读起来十分悦耳的总体对仗。

   Example sentencesExamples

   • However perfect its symmetry and proportions, a room might still leave us cold without such direct appeals to the eye, the body, and the spirit.
   • The workshop participants spend a whole day, working on their paintings and getting the proportion, tone and symmetry just right.
   • Such inconsistencies as there are in her statements of evidence of are in my judgment minor and do not challenge the overall symmetry and substance of her story.
   • Every detail exudes careful workmanship, from the perfect symmetry of the grind lines to the final hand rubbed blade finish.
   • Inspired by the architecture of ancient Greece and Rome, classic rooms have clean, simple lines and formal symmetry.
   • Following the rules of proportion and symmetry of the ancients was important to Brunelleschi but he wanted these mathematical principles of beauty to be those seen by all observers.
   • He found studying Greek art and architecture humbling, realising that all those years ago people knew so much about proportion and symmetry.
   • An out-of-court settlement cannot be one-sided; it must be based on parity, equity and symmetry, on the principle of give-and-take by both parties.
   • Sometimes he identifies the beautiful with the typical in nature, but in De re aedificatoria he constructs a theory of beauty around mathematical symmetry and proportion of parts.
   • This claim uncovers why we find certain formal properties such as symmetry and regularity aesthetically pleasing.
   • The judges were more interested in size than overall balance, proportion and symmetry.
   • Such was the proportion and perfect symmetry of her body, each part in harmony with the rest, that no one till then had ever seen its like among human kind - a living work of art, an object of desire to lovers of beauty.
   • I'm talking about classical proportions, perfect symmetry and ideal conditioning.
   • It's also the antithesis of a well-tailored suit, where you're looking for symmetry, flowing lines, and the ability to draw your attention to the face.
   • Yet somehow the house works thanks to Adler's innate sense of symmetry and proportion - and so does the Italian suburban villa in chilly Milwaukee.
   • In bodybuilding, symmetry is the balance of the various muscles to each other, as well as the upper body to the lower body and the right side to the left.
   • Admire its graceful entryway and its classic sense of proportion and symmetry.
   • In art it is often the departures from symmetry that are aesthetically pleasing or disturbing, and in science those same asymmetries are both revealing and informative.
   • The symmetry is pleasing, at the end of a narrative that is bracing, adventurous, touched by surprises, perfectly balanced and completely engrossing.
   • LAC Martin said the competition was judged on symmetry, proportion and balance - whether the body is balanced top to bottom and side to side.

   Synonyms

   balance, proportions, regularity, evenness of form, harmony, harmoniousness, consonance, concord, coordination
2. 1.2 Similarity or exact correspondence between different things.
   （不同事物之间的）对等（或相似）
   the political symmetry between the two debates

   count noun history sometimes exhibits weird symmetries between events

   历史事件有时候表现出令人不可思议的相似性。

   Example sentencesExamples

   • In other words, these projects are distinctive for not following the classic paradigm of symmetry between object of study or topic, fieldwork, and written product.
   • But there is also a curious symmetry between opponents of the death penalty, and opponents of euthanasia and living wills.
   • It's also a tidy world, with a degree of moral symmetry between the past and the present.
   • The symmetry between the two markets breaks down because whenever the central bank intervenes, it is always in the bond market, never in the commodity market.
   • Lino A. Graglia of the law school at the University of Texas is exceedingly impatient with such suggestions of symmetry between right and left.
   • There is a significant lack of symmetry between the two acts of the play, separated by a fifteen minute interval, which I found a distraction.
   • How do you establish some sort of symmetry between those ideas about civil society and what happens in the institutional church in your country?
   • I note as well that although there is overlap between the prior beneficial owners, and the present beneficial owners, there is no exact symmetry.
   • ‘There is a disconcerting symmetry between Prozac and Ritalin,’ he writes.
   • There was too great a link and matching symmetry between the different movements, each one anchored by a duet.
   • There is generally close symmetry between the opinions rendered by Doctors Woodside and Gojer.
   • As she was busy making sure that the spoons and forks were in perfect symmetry with each other, Damian took a good look at her.
   • The key point is its re-establishment of symmetry between social relations.
   • There is no necessary or easy symmetry between the contexts of reading and writing, nor between the scope of intention and motivation on the one hand and that of interpretation and response on the other.
   • The symmetry between Dan and Carter is clear and perhaps too overt at times, although never seems forced, or uncomfortable, which fits in nicely with the relaxed nature of the film.
   • There is also a certain symmetry between the two species, for the adherents of a politicised religion, like soldiers in an army, are in a permanent state of combat and vigilance.
   • This provides symmetry between deductibility by the companies and taxability of the employees which he says is the purpose of the section.
   • The symmetry between the fate of the Middle Eastern Nobel laureates and their Irish counterparts continues looking at those who have displaced them.
   • While there is likely to be a symmetry between the two ideas in this answer - pleasant work and nice people - there is no necessary correspondence between them.
   • Mr Roth was immediately outraged at what he regarded as gross insensitivity and an attempt to create a false symmetry between the two deaths.
3. 1.3Mathematics Physics count noun A law or operation where a physical property or process has an equivalence in two or more directions.
   〔物理，数〕对称
   Example sentencesExamples

   • Physicists have always looked for symmetries - and broken symmetries - because they can lead to fundamental principles.
   • In this theory a nonlinear symmetry unifies the Standard Model particles with heavy new particles.
   • The usual group of spacetime symmetries in relativistic quantum field theory is called the Poincaré group.
   • The mathematical beauty and experimental success of this idea have led physicists to extend it to higher energies and possible higher symmetries, as will be described below.
   • This connection provides the major conceptual apparatus of modern physics, through the concept of physical symmetries, or invariance principles, and valid transformations.
   • String theory and/or supersymmetry, for example, involve higher dimensions of space that introduce new degrees of freedom and possible violations of space-time symmetries such as Lorentz symmetry.