- To withdraw from fellowship, communion, or association;
to separate one's self by a solemn act; to draw off; to retire;
especially, to withdraw from a political or religious body.
Meaning of 'secede' (Princeton's WordNet)
1 . secede
[ v]
Meaning (1): - withdraw from an organization or communion
Example in sentence:
After the break up of the Soviet Union, many republics broke away