a region where a battle is being (or has been) fought; "they made a tour of Civil War battlefields
a region where a battle is being (or has been) fought; "they made a tour of Civil War battlefields"
You can refer to an issue or field of activity over which people disagree or compete as a battlefield. the domestic battlefield of family life. = battleground
A battlefield is a place where a battle is fought. the battlefields of the Somme. = battleground