A Captain

1. A chief or leader.
2. The person lawfully in command of a ship or other vessel.
3. An army officer with a rank between the most senior grade of lieutenant and major.
4. A naval officer with a rank between commander and commodore.
5. A commissioned officer in the United States Navy, Coast Guard, NOAA Corps, or PHS Corps of a grade superior to a commander and junior to a rear admiral (lower half). A captain is equal in grade or rank to an Army, Marine Corps, or Air Force colonel.
6. One of the athletes on a sports team who is designated to make decisions, and is allowed to speak for his team with a referee or official.
7. The leader of a group of workers.
8. The head boy of a school.
9. A maître d', a headwaiter.
10. (Southern US) An honorific title given to a prominent person. See colonel.

Synonyms

• (leader of a group of workers): supervisor, straw boss, foreman
• (commander of a vessel): skipper, master
• (pilot in command): pilot, pilot in command
• (military rank): CAPT, CAPT., Capt., Capt, CPT (abbreviation)