militancy

[See Militant.]

1. The state of being militant; warfare.

2. A military spirit or system; militarism. H. Spencer.

noun

1. Hostile behavior: aggression, aggressiveness, belligerence, belligerency, combativeness, contentiousness, hostility, militance. See attack/defend.
2. Warlike or hostile attitude or nature: bellicoseness, bellicosity, belligerence, belligerency, combativeness, contentiousness, hostility, militance, pugnaciousness, pugnacity, truculence, truculency. See attack/defend.

The noun has one meaning:

Meaning #1: a militant aggressiveness
  Synonyms: combativeness, militance