first lieutenant definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- U.S. Mil. an officer ranking above a second lieutenant and below a captain
- U.S. Navy the officer in charge of maintenance of a ship or shore station
first lieutenant definition by American Heritage Dictionary
- A commissioned rank in the U.S. Army, Air Force, and Marines that is above second lieutenant and below captain.
- One who holds this rank.
- A lieutenant in the U.S. Navy or Coast Guard, responsible for maintaining the ship's exterior and for management of the ship's deck.