first lieutenant


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

1
:  a commissioned officer in the army, air force, or marine corps ranking above a second lieutenant and below a captain
2
:  a naval officer responsible for a ship's upkeep

First Known Use of FIRST LIEUTENANT

1706

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