Definitions for "Secede"
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.
withdraw from an organization or communion; "After the break up of the Soviet Union, many republics broke away"
To leave an organization. In the Civil War those states that chose to withdraw from the United States to form the Confederate States of America "seceded" from the Union.