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
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
1.direct or command as an officer