the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | an officer in a police force |
a person or thing that is a resource that helps make something easier or possible to do | a commissioned military officer |
a means of serving | an assistant with power to act when his superior is absent |
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose | an officer holding a commissioned rank in the United States Navy or the United States Coast Guard; below lieutenant commander and above lieutenant junior grade |