secession
Concise Oxford English Dictionary © 2008 Oxford University Press:
secession /sɪˈsɛʃ(ə)n/
▶noun the action of seceding from a federation or organization.
■ (the Secession) historical the withdrawal of eleven Southern states from the US Union in 1860, leading to the Civil War.
– derivatives
secessional adjective,
secessionism noun,
secessionist noun.
secessional adjective,
secessionism noun,
secessionist noun.
'secession' also found in these Oxford entries:

