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first mate

American

noun

the officer of a merchant vessel next in command beneath the captain.

first mate British

noun

Also called: first officer. an officer second in command to the captain of a merchant ship

"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.

She lists the many infractions the first mate committed and defies any among them to countermand her husband’s orders.

From The Wall Street Journal • Dec. 8, 2025

Its captain and first mate were detained but later released, and the vessel was able to head towards the Suez Canal.

From Barron's • Oct. 11, 2025

At dusk on the second day, about 75 Rongelapese crowded the decks and cabins of the ship, many of them huddling under a tarp the ship’s first mate, Martini Gotjé, had strung up.

From Slate • Jul. 22, 2025

As captain and first mate, they say piloting their 75-foot schooner has only strengthened their brotherly bond, with their small expedition team serving as an adoptive family.

From BBC • Aug. 25, 2024

So they went back to the captain’s cabin and the first mate knocked.

From "The Seven Wonders of Sassafras Springs" by Betty G. Birney

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