The Collaborative International Dictionary of English v.0.48:
battlefield \bat"tle*field\ n. a region where a battle is fought. Syn: battleground, field of battle, field. [WordNet 1.5]WordNet (r) 3.0 (2006):
battlefield n 1: a region where a battle is being (or has been) fought; "they made a tour of Civil War battlefields" [syn: battlefield, battleground, field of battle, field of honor, field]