officer in WordNet English dictionary

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"
   military officer  officer 
   
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"
   officeholder  officer 
   
3. a member of a police force
   "it was an accident, officer"
   policeman  police officer  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"
   officer  ship's officer 
   

1. direct or command as an officer
   officer