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