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



    BrE BrE//lefˈtenənt//
    ; NAmE NAmE//luːˈtenənt//
    (abbreviation Lieut., Lt) The army, The police, The navy
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  1. 1 an officer of middle rank in the army, navy, or air force Lieutenant Paul Fisher see also flight lieutenant, second lieutenant, sub lieutenant See related entries: The army, The navy
  2. 2 (in compounds) an officer just below the rank mentioned a lieutenant colonel See related entries: The army, The navy
  3. 3 (in the US) a police officer of fairly high rank See related entries: The police
  4. 4a person who helps somebody who is above them in rank or who performs their duties when that person is unable to
  5. Word Origin late Middle English: from Old French (see lieu, tenant).
See the Oxford Advanced American Dictionary entry: lieutenant