secession secession /sɪˈsɛʃən/

noun

1. Formal separation from an alliance or federation  ( secession , withdrawal )
   formal separation from an alliance or federation
   
2. An Austrian school of art and architecture parallel to the French art nouveau in the 1890s  ( secession , sezession )
   an Austrian school of art and architecture parallel to the French art nouveau in the 1890s
   

 Secession

1. The withdrawal of eleven southern states from the Union in 1860 which precipitated the American Civil War  ( Secession )
   the withdrawal of eleven southern states from the Union in 1860 which precipitated the American Civil War