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first officer

American

noun

first mate.
copilot.

first officer British

noun

another name for first mate
the member of an aircraft crew who is second in command to the captain

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The captain and his first officer were taken into police custody in early October before returning to sea.

From Barron's • Feb. 23, 2026

She knelt in front of the first officer she saw, told him she’d fled the colectivos, and pleaded for a chance to seek asylum.

From Slate • Jan. 15, 2026

The first officer, Clive Kunder, who was the pilot directly responsible for flying, did pull up at the end.

From The Wall Street Journal • Nov. 28, 2025

She was the first officer to pursue the defendant down the alleyway.

From BBC • Jun. 10, 2025

What the engineer means is just what the first officer meant.

From "Outliers" by Malcolm Gladwell

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023