Definition of first lieutenant noun from the Oxford Advanced Learner's Dictionary

     

    first lieutenant

     noun
    noun
    BrE
     
    ; NAmE
     
    The army, The navy
     
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  1. 1an officer in the navy with responsibility for managing a ship, etc. under the guidance of the captain See related entries: The navy
  2. 2an officer in the US army and air force just below the rank of a captain See related entries: The army, The navy
  3. 3(informal) a person who is the next most important to somebody
See the Oxford Advanced American Dictionary entry: first lieutenant