Etymology
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infield (n.)

1733, "land of a farm which lies nearest the homestead," from in (adv.) + field (n.). Baseball diamond sense first attested 1866. Related: Infielder (1867).

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Definitions of infield

infield (n.)
the area of a baseball field that is enclosed by 3 bases and home plate;
Synonyms: baseball diamond / diamond
From wordnet.princeton.edu