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- (countable) An officer is a person in an army who has much authority. A general and a captain are two types of officers.
- A soldier must obey his commanding officer.
- (countable) An officer is a policeman, often called a "police officer." (Note, "officer" is often better than "policeman" because the officer could be a woman or a man.)
- (countable) An officer is someone who holds office (meaning, has authority).