Baseball is defined as a sports game played with a bat and a ball between two teams where players have to hit a ball and score runs, or the ball used in this game.(noun)
The definition of baseball is relating to the sports game between two teams where players have to hit a ball with a bat in order to score runs.(adjective)
An example of baseball used as an adjective is in the phrase "baseball mitt," which means a mitt used in this game.
See baseball in Webster's New World College Dictionary
See baseball in American Heritage Dictionary 4
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