Definition of captaining:
(n) :
The person lawfully in command of a ship or other vessel.
(n) :
An army officer with a rank between the most senior grade of lieutenant and major.
(n) :
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 a United States Army, Marine Corps, or Air Force colonel.
(n) :
(aviation) A rank qualifying an airline pilot to act as pilot in command of a two-pilot flight crew.
(n) :
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.
(n) :
A chief or leader.