first base

noun

Synonyms of first basenext
1
: the base that must be touched first by a base runner in baseball
2
: the player position for defending the area around first base
3
: the first step or stage in a course of action
plans never got to first base
first baseman noun

Examples of first base in a Sentence

a runner on first base She hit a ground ball to first base. He used to be a catcher, but now he plays first base.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Harrison followed with his first hit of the season, driving Chestnut in from first base. Tony Catalina, Austin American Statesman, 14 Feb. 2026 Since the Guardians want Manzardo playing more (and better) first base and Fry can spell him there, let’s say Kayfus starts in Columbus. Zack Meisel, New York Times, 12 Feb. 2026 Team officials have floated the idea of Paredes moving around and getting at-bats at third base, first base, second base and DH. Matt Kawahara, Houston Chronicle, 11 Feb. 2026 The Mets made a splash, signing Bo Bichette to play third base, traded for Marcus Semien to play second base and signed Jorge Polanco to play first base. Ryan Canfield, FOXNews.com, 10 Feb. 2026 See All Example Sentences for first base

Word History

First Known Use

1848, in the meaning defined at sense 1

Time Traveler
The first known use of first base was in 1848

Browse Nearby Words

Cite this Entry

“First base.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/first%20base. Accessed 15 Feb. 2026.

Kids Definition

first base

noun
: the base that must be touched first by a base runner in baseball
also : the position of the player defending the area around first base

More from Merriam-Webster on first base

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster