first lieutenant

noun

: an officer in the U.S. Army, Air Force, or Marine Corps who ranks below a captain

: a naval officer who is responsible for keeping a ship in good condition

Full Definition of FIRST LIEUTENANT

: a commissioned officer in the army, air force, or marine corps ranking above a second lieutenant and below a captain

: a naval officer responsible for a ship's upkeep

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FIRST LIEUTENANT Defined for Kids

noun

: a commissioned officer in the army, air force, or marine corps ranking above a second lieutenant

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