First-officer Definition

noun

The copilot of an aircraft.

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The chief mate of a merchant ship.
Wiktionary

The executive officer, second in command of a naval vessel.

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The most senior civil servant in the United States Foreign Service, with responsibility for running an embassy under the authority of and reporting to the ambassador.

Wiktionary
Air Transport Auxiliary rank corresponding to Flight Lieutenant in the Royal Air Force.
Wiktionary

Other Word Forms of First-officer

Noun

Singular:
first-officer
Plural:
first officers

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