Definition of first-degree in English:
 first-degree
adjectiveˌfəːstdɪˈɡriːˈˌfərst dəˈˌɡri
1Medicine 
attributive Denoting burns that affect only the surface of the skin and cause reddening.
 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 
attributive Denoting the most serious category of a crime, especially murder.
 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.