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

"We saw a red flare, so my first mate and I went to the position, and we found this life raft drifting," he told Reuters.

From BBC • Aug. 19, 2024

And in time, I may find myself his first mate whether I want to or not, journeying to points exotic so that I might make another dive, and another, and another.

From "Challenger Deep" by Neal Shusterman

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