The difference between First mate and First officer
When used as nouns, first mate means an officer on a merchant ship next in rank to the captain and responsible to the captain for the safety and security of the ship, whereas first officer means the copilot of an aircraft.
check bellow for the other definitions of First mate and First officer
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First mate as a noun (nautical):
An officer on a merchant ship next in rank to the captain and responsible to the captain for the safety and security of the ship.
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First officer as a noun:
The copilot of an aircraft.
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First officer as a noun:
The chief mate of a merchant ship.
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First officer as a noun:
The executive officer, second in command of a naval vessel.
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First officer as a noun:
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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First officer as a noun:
Air Transport Auxiliary rank corresponding to Flight Lieutenant in the Royal Air Force.
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First officer as a noun:
Women's Royal Naval Service rank corresponding to Lieutenant-Commander in the Royal Navy.