Secede :: Secede (v. i.) 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..
Seceder :: Seceder (n.) One of a numerous body of Presbyterians in Scotland who seceded from the communion of the Established Church, about the year 1733, and formed the Secession Church, so called..