Noun
The quality of being belligerent; act or state of making war; warfare.
Source: Webster's dictionaryRecognition of belligerency as an expression of sympathy is all very well. Henry Cabot Lodge
the outbreak of hostilities Source: Internet
With the ravages of democratic ideas, however, the modern republic cannot go to war under the old conceptions of autocracy and death-dealing belligerency. Source: Internet
She could relate to belligerency, and they became fast friends. Source: Internet