Belligerency (noun)

1. The state or condition of being at war; hostility or aggression towards others.
2. The act of engaging in hostilities or aggression towards others.

Origin:

The word "belligerency" is formed from the word "belligerent" which comes from the latin word "belligerare" meaning "to wage war". it was first recorded in english in the early 17th century.

Examples:

1. The country's declaration of belligerency marked the beginning of the war.
2. The country's belligerency towards its neighbor led to a major conflict.
3. The belligerency of the two countries caused widespread destruction.
4. His belligerency was the main reason for the breakdown of the negotiations.
5. The belligerency of the country was a major threat to peace and stability in the region.