first lieutenant

/F ER1 S T L UW0 T EH1 N AH0 N T/
noun
  1. 1

    The second lowest rank of a commissioned officer in the United States Army, Air Force, or Marine Corps, ranking above a second lieutenant and below a captain. The rank of first lieutenant is equivalent to the naval rank of lieutenant junior grade.

  2. 2

    An equivalent rank in other military forces.

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Source: https://en.wiktionary.org/wiki/first%20lieutenant