Definition of "first officer" [first officer]

• The copilot of an aircraft. (noun)

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• "Rooney Lee, the first officer of rank to arrive at Sycamore Springs, stripped quickly and swam into the stream to test it."
• "Kirk started to say something else to Spock, but his first officer straightened up quickly, and without a word walked from the room."
• "Standing behind Lieutenant Diamond at the weapons and defense station, the Andorian first officer said, “Phasers standing by, sir.”"