1. [ noun ] (baseball,sport) the fielding position of the player on a baseball team who is stationed at first base
Synonyms: first
Related terms: position baseball_team
2. [ noun ] (baseball,games) the base that must be touched first by a base runner in baseball
Related terms: base
3. [ noun ] the initial stage in accomplishing something

"we didn't get to first base with that approach"

Related terms: first_step
Similar spelling:   first_baseman