first baseman

noun

plural first basemen
: the baseball player stationed at the first-base position

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first base
first baseman
first bass
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“First baseman.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/first%20baseman. Accessed 14 Feb. 2026.

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Kids Definition

first baseman

noun
: the player defending the area around first base
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