* Noun: A brevet is a document that grants a rank or commission in the armed forces without actual service.
* Example: "He received a brevet for his bravery in the war."
* Adjective: Brevet can also be used as an adjective meaning "holding a rank without serving in the corresponding position."
* Example: "He was a brevet colonel, although he had only served as a captain."
The most common usage is as a noun, but it can also be used as an adjective in specific contexts.