From The Collaborative International Dictionary of English v.0.48 [gcide]:
Infield \In"field`\, n.
1. Arable and manured land kept continually under crop; --
distinguished from outfield. [Scotland] --Jamieson.
[1913 Webster]
2. (Baseball) The diamond; -- opposed to outfield. See
Diamond, n., 5.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Infield \In*field"\, v. t.
To inclose, as a field. [R.]
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
infield
n 1: the area of a baseball field that is enclosed by 3 bases
and home plate [syn: baseball diamond, diamond,
infield] [ant: outfield]