Webster's Revised Unabridged Dictionary · 1913

Belligerence

Belligerence ({not transcribed}) , noun

The quality of being belligerent.
2.
the act or state of being engaged in war or a warlike conflict; warfare.
3.
an aggressively hostile or warlike attitude or nature; a readiness to fight or offend, with little or no provocation.

Also: Belligerency