first base

noun

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.
Or, the Giants may ask Devers to play first base, where left-handed hitting Dominic Smith is now the regular starter. Bernie Pleskoff, Forbes.com, 16 June 2025 Pivetta fielded a grounder and ran it to first base for the second out in the third inning and then ran to first base and grabbed a ball that bounced off the bag for the third out. Kevin Acee, San Diego Union-Tribune, 16 June 2025 However, things took another turn when Devers was asked by chief baseball officer Craig Breslow to play first base in the wake of Triston Casas' season-ending knee injury. Aaliyan Mohammed, MSNBC Newsweek, 16 June 2025 But when Tristan Casas injured his left knee and was lost for the season, Devers refused to move again to fill the gap at first base. Barry M. Bloom, Sportico.com, 16 June 2025 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 20 Jun. 2025.

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!