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first lieutenant

  1. U.S. Mil. an officer ranking above a second lieutenant and below a captain
  2. U.S. Navy the officer in charge of maintenance of a ship or shore station

See first lieutenant in American Heritage Dictionary 4

noun
  1. A commissioned rank in the U.S. Army, Air Force, and Marines that is above second lieutenant and below captain.
  2. One who holds this rank.
  3. 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.

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