Source : Webster's Revised Unabridged Dictionary (1913)

Militancy \Mil"i*tan*cy\, n. [See {Militant}.]
   1. The state of being militant; warfare.

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

Source : WordNet®

militancy
     n : a militant aggressiveness [syn: {combativeness}, {militance}]