Secession is breaking away from a country to form a new one. The secession of the South, threaten secession, a secession referendum.
Almost no constitution allows it, which is why it usually ends in war or in a negotiated exception. The American Civil War began with the secession of eleven states, and the peaceful division of Czechoslovakia in 1993 is the standard counter-example.
1nounsecessionBreaking away from a country to form a new one.
“Talk of secession grew as the northern province demanded its own flag and army.”
secession is a breaking away.
Latin secessio means a withdrawing, from secedere — se, apart, plus cedere, to go.
Latin
sēcessiō — a withdrawing
English, today
secession
From Latin sēcessiō (“a withdrawing”).
Etymology from Wiktionary, CC BY-SA