First-base definition

(slang) The first stage or step toward completion or success.
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The first of the bases in the infield, counterclockwise from home plate.
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The fielding position occupied by the first baseman.
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The base to the left of the pitcher, the first of the four bases that a base runner attempts to reach safely.
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The defensive position played by the first baseman.
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(singular only, baseball) The base after home plate in a counter-clockwise path around a baseball infield.

The runner took his lead off of first base.

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(singular only, by extension) Completion of the first phase of an activity.
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(singular only, US, colloquial) Kissing.
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(slang) get to first base
  • to accomplish the first step of an undertaking, often, specif., a romantic or sexual one
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Idioms and Phrasal Verbs