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

lieutenant

noun
 
/lefˈtenənt/
 
/luːˈtenənt/
(abbreviation Lieut., Lt)
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  1. an officer of middle rank in the army, navy, or air force
    • Lieutenant Paul Fisher
    see also first lieutenant, flight lieutenant, second lieutenant, sub lieutenantTopics War and conflictc2
  2. (in compounds) an officer just below the rank mentioned
    • a lieutenant colonel
    Topics War and conflictc2
  3. (in the US) a police officer of fairly high rankTopics Law and justicec2
  4. a person who helps somebody who is above them in rank or who performs their duties when that person is unable to
  5. see also Lord Lieutenant
    Word Originlate Middle English: from Old French (see lieu, tenant).
See lieutenant in the Oxford Advanced American Dictionary
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