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Definition of first officer noun from the Oxford Advanced Learner's Dictionary

first officer

noun

/ˌfɜːst ˈɒfɪsə(r)/

/ˌfɜːrst ˈɑːfɪsər/

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(also first mate)
the officer on a commercial ship just below the rank of captain or master

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the second in command to the captain on an aircraft

See first officer in the Oxford Advanced American Dictionary

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first officer

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noun

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B2

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