/ ˈɒfɪsə(r); NAmE ˈɔːf-; ˈɑːf-/ noun
1.
a person who is in a position of authority in the armed forces :
army / airforce / naval, etc. officers
a commissioned / non-commissioned officer
The matter was passed on to me, as your commanding officer .
—see also flying officer , petty officer , pilot officer , warrant officer
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
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.
( NAmE ) a title for a police officer :
Officer Dibble
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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.