first officer

/F ER1 S T AO0 F AH0 S ER0/

noun

1
The copilot of an aircraft.
2
The chief mate of a merchant ship.
3
The executive officer, second in command of a naval vessel.
4
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.
5
Air Transport Auxiliary rank corresponding to Flight Lieutenant in the Royal Air Force.
6
Women's Royal Naval Service rank corresponding to Lieutenant-Commander in the Royal Navy.

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