secede

verb (used without object), se·ced·ed, se·ced·ing.

1. to withdraw formally from an alliance, federation, or association, as from a political union, a religious organization, etc.

verb

1. (intr often foll by from) (of a person, section, etc) to make a formal withdrawal of membership, as from a political alliance, church, organization, etc

v.1702, “to leave one’s companions,” from Latin secedere “go away, withdraw, separate; rebel, revolt” (see secession). Sense of “to withdraw from a political or religious alliance of union” is recorded from 1755, originally especially in reference to the Church of Scotland. Related: Seceded; seceding; seceder.