Definitions for secedesɪˈsid
Random House Webster's College Dictionary
to withdraw formally from an alliance, federation, or association.
Origin of secede:
1695–1705; < L sēcēdere to withdraw. See se -, cede
secede, splinter, break away(verb)
withdraw from an organization or communion
"After the break up of the Soviet Union, many republics broke away"
To split from or to withdraw from membership of a political union, an alliance or an organisation.
To split or to withdraw one or more constituent entities from membership of a political union, an alliance or an organisation.
Origin: From secedo, from se- ("apart") + cedo.
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