Definition of lieutenant noun from the Oxford Advanced American Dictionary

     

    lieutenant

     noun
    noun
    NAmE//luˈtɛnənt//
     
    (abbreviation Lieut., Lt.)
     
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  1. 1 an officer of middle rank in the army, navy, or air force Lieutenant Paul Fisher see also second lieutenant
  2. 2(in compounds) an officer just below the rank mentioned a lieutenant colonel
  3. 3 a police officer or firefighter of fairly high rank
  4. 4a person who helps someone who is above them in rank or who performs their duties when that person is unable to
See the Oxford Advanced Learner's Dictionary entry: lieutenant