infield

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The area of the field bounded by home plate and first, second, and third bases.
• noun The defensive positions of first base, second base, third base, and shortstop considered as a unit.
• noun The area inside a racetrack or running track.
• noun A field located near a farmhouse.

from The Century Dictionary.

• To inclose, as a piece of land; make a field of.
• Under crop; noting arable land which is still kept under crop: distinguished from outfield.
• noun In base-ball. See field, n., 3.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb rare To inclose, as a field.
• noun Scotland Arable and manured land kept continually under crop; -- distinguished from outfield.
• noun (Baseball) The diamond; -- opposed to outfield. See Diamond, n., 5.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The area inside a racetrack or running track.
• noun A constrained scope or area.
• noun agriculture An area to cultivate: a field
• noun baseball The region of the field roughly bounded by the home plate, first base, second base and third base.
• noun baseball (as a modifier, functioning as an adjective) Of an event, happening in the infield.
• noun cricket The region of the field roughly bounded by the wicket keeper, slips, gully, point, cover, mid off, mid on, midwicket and square leg.
• verb transitive To inclose (a piece of land); make a field of.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the area of a baseball field that is enclosed by 3 bases and home plate