From The Collaborative International Dictionary of English v.0.48 :
centerfield \cen"ter*field"\, center field \cen"ter
field"\(s[e^]n"t[~e]r*f[=e]ld") n. (Baseball)
The part of the outfield directly ahead of the catcher.
Syn: center.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) :
center field
n 1: the piece of ground in the outfield directly ahead of the
catcher; "he hit the ball to deep center" [syn: center
field, centerfield, center]
2: the fielding position of the player on a baseball team who is
expected to field balls in the central third of the outfield
[syn: center field, centerfield]