Definitions
1.nounA contest, a struggle."the battle of life"
2.nounA general action, fight, or encounter, in which all the divisions of an army are or may be engaged; a combat, an engagement.
3.nounA division of an army; a battalion.
4.nounThe main body of an army, as distinct from the vanguard and rear; the battalia.
5.verbTo join in battle; to contend in fight"Scientists always battle over theories."
6.verbTo fight or struggle; to enter into a battle with."She has been battling cancer for years."