Definition of officer noun from the Oxford Advanced American Dictionary

      

    officer

     noun
    noun
    NAmE//ˈɔfəsər//
     
    , NAmE//ˈɑfəsər//
     
     
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  1. 1 a person who is in a position of authority in the armed forces army/air force/naval, etc. officers The matter was passed on to me, as your commanding officer. see also petty officer, warrant officer
  2. 2 (often in compounds) a person who is in a position of authority in the government or a large organization a customs/prison/court officer officers of state (= people in high positions in the government) see also chief executive officer, press officer, probation officer
  3. 3(often used as a form of address) = police officer the officer in charge of the case the investigating officer Yes, officer, I saw what happened.
  4. 4 a title for a police officer Officer Daley
See the Oxford Advanced Learner's Dictionary entry: officer