In baseball, the area of the playing field inside the diamond formed by the four bases.
Compound word from 'in' + 'field,' created to distinguish the closer playing area from the 'outfield.' The term became standard baseball vocabulary in the 19th century as the sport developed its modern rules and terminology. It reflects the spatial organization of the game.
Baseball's infield became mathematically precise—bases exactly 90 feet apart—and this geometric perfection is why baseball is called the 'thinking man's sport'; the infield is a chess game played at full speed where positioning is everything.
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