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

      

    officer

     noun
    noun
    BrE BrE//ˈɒfɪsə(r)//
     
    ; NAmE NAmE//ˈɔːfɪsər//
     
    , NAmE//ˈɑːfɪsər//
     
    The police, Job titles
     
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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 a commissioned/non-commissioned officer The matter was passed on to me, as your commanding officer. Wordfinderarmy, artillery, battalion, command, defend, invade, officer, regiment, tactics, weapon see also flying officer, petty officer, pilot officer, warrant officer
  2. 2  (often in compounds) a person who is in a position of authority in the government or a large organization an environmental health officer a customs/prison/welfare officer officers of state (= ministers in the government) see also chief executive officer, medical officer, press officer, probation officer, returning officer See related entries: Job titles
  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. See related entries: The police
  4. 4(North American English) a title for a police officer Officer Dibble
  5. Word Origin Middle English: via Anglo-Norman French from medieval Latin officiarius, from Latin officium ‘performance of a task’ (in medieval Latin also ‘office, divine service’), based on opus ‘work’ + facere ‘do’.Extra examples 100 officers swooped on various south Essex locations. He telephoned the duty officer at regimental headquarters. He’s a retired Army intelligence officer. Khan has been appointed chief executive officer. Officers raided an address in south London, seizing bomb-making equipment. Officers raided an address in the Pittsburgh area. Report the incident to the responsible officer. The charity has a full-time press officer working with the national newspapers. The decision rests with the ranking officer. We spoke to the duty officer at the police station. a former army officer who served in Bosnia a former navy chief petty officer an education welfare officer officers investigating the murder the officer commanding the infantry the officer responsible for implementing the plan to salute a superior officer Drug squad officers raided a warehouse near Heathrow. I tried to find out who was the officer in charge of the case. If you’re concerned, you should go to a student welfare officer to discuss the problem. Trading standards officers seized a large number of fake goods. Two uniformed officers attended the scene of the accident. Voters should report any irregularities to the presiding officer. the chief medical officer the company’s Chief Executive/​Financial Officer
See the Oxford Advanced American Dictionary entry: officer