The Collaborative International Dictionary of English v.0.48:
battleground \bat"tle*ground\ n. a region where a battle is fought; same as battlefield. Syn: battlefield, field of battle, field. [WordNet 1.5]WordNet (r) 3.0 (2006):
battleground 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]