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English definition of “first base”

first base

noun [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)
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