Definitions:

1. a member of a police force noun
   • it was an accident, officer
2. a person authorized to serve in a position of authority on a vessel noun
   • They are the officer in charge of the ship's engines.
3. any person in the armed services who holds a position of authority or command noun
   • An officer is responsible for the lives of their men.
4. someone who is appointed or elected to an office and who holds a position of trust noun
   • They are an officer of the court.

Synonyms:

• military officer
• officeholder
• police officer
• policeman
• ship's officer