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WordNet (r) 3.0 (2006) (WordNet)

baseball
n 1: a ball game played with a bat and ball between two teams of
nine players; teams take turns at bat trying to score runs;
"he played baseball in high school"; "there was a baseball
game on every empty lot"; "there was a desire for National
League ball in the area"; "play ball!" [synonym: {baseball},
{baseball game}]
2: a ball used in playing baseball