division or disunion, esp. into mutually opposed parties.

the parties so formed.

Ecclesiastical .

a formal division within, or separation from, a church or religious body over some doctrinal difference.

the state of a sect or body formed by such division.

the offense of causing or seeking to cause such a division.

noun

alienation , break , breakup , difference , disagreement , discord , dissension , disunion , division , divorce , faction , fissure , fracture , gap , parting , rift , rupture , secession , splinter group , split , disaffection , estrangement , rent , clash , confrontation , contention , difficulty , disaccord , discordance , dissent , dissentience , dissidence , dissonance , friction , inharmony , strife , variance , war , warfare , disunity , divergence , divergency , breach , disharmony , separation