First-officer meaning

The copilot of an aircraft.
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The chief mate of a merchant ship.
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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.
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Air Transport Auxiliary rank corresponding to Flight Lieutenant in the Royal Air Force.
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Women's Royal Naval Service rank corresponding to Lieutenant-Commander in the Royal Navy.
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