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Definition of first lieutenant noun from the Oxford Advanced American Dictionary

     

    first lieutenant

     noun
    noun
     
     
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  1. 1an officer in the U.S. army, air force, or marine corps, just below the rank of a captain
  2. 2an officer in the navy with responsibility for managing a ship, etc.
  3. 3(informal) a person who is the next most important to someone
See first lieutenant in the Oxford Advanced Learner's Dictionary