Noun
1. any person in the armed services who holds a position of authority or command;
"an officer is responsible for the lives of his men"2. someone who is appointed or elected to an office and who holds a position of trust;
"he is an officer of the court""the club elected its officers for the coming year"3. a member of a police force;
"it was an accident, officer"4. a person authorized to serve in a position of authority on a vessel;
"he is the officer in charge of the ship's engines"