'Secessionism' definitions:

Definition of 'secessionism'

From: WordNet
noun
A doctrine that maintains the right of secession

Definition of 'Secessionism'

From: GCIDE
  • Secessionism \Se*ces"sion*ism\, n. The doctrine or policy of secession; the tenets of secession; the tenets of secessionists. [1913 Webster]