In baseball, a pitch thrown very quickly with great speed, one of the most common types of pitches.
A straightforward compound of 'fast' and 'ball,' this term emerged in American baseball vocabulary in the late 19th century as the sport was formalized.
A major league fastball travels at about 90+ mph—so fast that the batter has less than 0.4 seconds to see it, decide to swing, and start moving the bat!
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