- the first in counterclockwise order of the bases from home plate.
- the position of the player covering the area of the infield near first base.
- first amendment,
- first and foremost,
- first and last,
- first axiom of countability,
- first balkan war,
- first baseman,
- first blood,
- first blush,
- first cause,
- first chamber
- to succeed in the initial phase of a plan or undertaking: His suggestions for labor-saving techniques never got to first base.
- to engage in petting that goes no further than kissing.
Origin of first base
Examples from the Web for first base
The ball bounded off the tip end of the bat and went whirling along the first-base line.The Crimson Sweater|Ralph Henry Barbour
Way bunted down the first-base line, and managed to beat out the throw.The Lucky Seventh|Ralph Henry Barbour
On the first pitch, as Dreer got a fast start for second, Hollis bunted down the first-base line.The Young Pitcher|Zane Grey
Andy did take his time, and as a result got four balls and walked to first-base.The Putnam Hall Rivals|Arthur M. Winfield
He is entitled to first-base if the pitcher pitches four bad balls, at none of which he (the batsman) has struck.
- the base that a runner must reach safely to score a hit, and the first of the three bases he must reach safely on the way to home plate in order to score a run
- the fielding position nearest this base