a person authorized to serve in a position of authority on a vessel
"he is the officer in charge of the ship's engines"
- ship's officer
a member of a police force
"it was an accident, officer"
- police officer
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"
any person in the armed services who holds a position of authority or command
"an officer is responsible for the lives of his men"
- military officer
direct or command as an officer