Meaning of “first base” in the English Dictionary

"first base" in British English

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first basenoun [ C usually singular ]

uk /ˌfɜːst ˈbeɪs/ us /ˌfɝːst ˈbeɪs/ also informal first

in baseball, the first of four places you must run to after hitting the ball and before scoring a point, or the position of a player defending this place:

Mattingly played first base for the Yankees.

(Definition of “first base” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"first base" in American English

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first basenoun [ U ]

/ˈfɜrst ˈbeɪs/

first base noun [ U ] (PLACE)

the first place a baseball player has to touch in order to score, or the position near this place played by a member of the team in the field

first base noun [ U ] (STAGE)

the first successful stage in a series of actions you take to achieve a goal:

His proposal didn't get to first base with the committee.

(Definition of “first base” from the Cambridge Academic Content Dictionary © Cambridge University Press)