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

-ˈbā-smən 

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

After refusing to play first base in Boston, Devers has primarily been a first baseman in San Francisco. — Justice Delos Santos, Mercury News, 21 Aug. 2026

Pete Alonso skipped sideways toward first base while his drive sailed toward the foul pole in left field. — ABC News, 20 Aug. 2026

Pirela was signed by the Rangers at age 17 out of Barquisimeto, Venezuela, and played catcher, first base and the outfield from 2009 to 2011 for the team’s Dominican Republic Summer League affiliate. — Steve Henson, Los Angeles Times, 19 Aug. 2026

In the second game of Monday’s doubleheader, Marmol showed his words weren’t just platitudes, pitching to Reds shortstop Elly De La Cruz to start the bottom of the 10th inning with the automatic runner on second and first base open. — C. Trent Rosecrans, New York Times, 19 Aug. 2026

Word History

First Known Use

1848, in the meaning defined at sense 1

Rhymes for first base

• abase
• airspace
• apace
• backspace
• biface
• birthplace
• blackface
• boldface
• bookcase
• braincase
• briefcase
• carcase

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