1Medicine attributiveDenoting burns that affect only the surface of the skin and cause reddening.
〔医〕（烧伤）最轻度的，（第）一度的
Example sentencesExamples
Second- and third-degree burns both require professional medical attention, as do first-degree burns if they occur over a large part of the body.
Scarring from first-degree burns and light second-degree burns may disappear within a few months.
Thin or superficial burns (also called first-degree burns) are red and painful.
The corpsman said that a small third-degree burn might be difficult to recognize if it is located in an area of second- or even first-degree burn skin damage.
More than once he has ended up with first-degree burns.
2North American Law attributiveDenoting the most serious category of a crime, especially murder.
〔律〕〈主北美〉（罪行，尤指谋杀罪）一级的，一等的，最严重的
he was convicted of first-degree murder
Example sentencesExamples
I decided to present this case through a Broward County grand jury and they indicted him for first-degree murder as an adult.
Pennsylvania was the first U.S. state to abolish capital punishment for all crimes except first-degree murder.
Let's face it, everybody understands premeditated, first-degree murder.
Now he awaits trial for first-degree murder, attempted murder, and aggravated battery.
He was convicted of first-degree murder and sentenced to death.
Definition of first-degree in US English:
first-degree
adjectiveˈˌfərst dəˈˌɡri
1Medicine Denoting burns that affect only the surface of the skin and cause reddening.
〔医〕（烧伤）最轻度的，（第）一度的
Example sentencesExamples
The corpsman said that a small third-degree burn might be difficult to recognize if it is located in an area of second- or even first-degree burn skin damage.
Second- and third-degree burns both require professional medical attention, as do first-degree burns if they occur over a large part of the body.
Scarring from first-degree burns and light second-degree burns may disappear within a few months.
Thin or superficial burns (also called first-degree burns) are red and painful.
More than once he has ended up with first-degree burns.
2North American Law Denoting the most serious category of a crime, especially murder.
〔律〕〈主北美〉（罪行，尤指谋杀罪）一级的，一等的，最严重的
he was convicted of first-degree murder
Example sentencesExamples
He was convicted of first-degree murder and sentenced to death.
Pennsylvania was the first U.S. state to abolish capital punishment for all crimes except first-degree murder.
I decided to present this case through a Broward County grand jury and they indicted him for first-degree murder as an adult.
Let's face it, everybody understands premeditated, first-degree murder.
Now he awaits trial for first-degree murder, attempted murder, and aggravated battery.