Secessionism

noun

1. The policy of those advocating secession or supporting the right of secession.
2. The doctrine of secession; the principle that affirms the right of a person or party to secede, separate, or withdraw from a political or religious organization, or the right of a state to secede at its pleasure from a federal union.
3. The doctrine or policy of secession; the tenets of secession; the tenets of secessionists.
4. The doctrine or policy of secession.
5. a doctrine that maintains the right of secession