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English definition of “officer”

officer

noun [C]     /ˈɒfɪsər/
MILITARY B2 someone with an important job in a military organization : an army / naval officer People in charge of or controlling other peopleBosses, managers and directorsRanks in the Army
GOVERNMENT B1 someone who works for a government department : a customs officer a prison officerGovernment ministers and civil servants
POLICE B1 a police officer: a uniformed officer → See also probation officerPeople who work for the police service
(Definition of officer noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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