Secession, n.
Etymology: [L. secessio: cf. F. sécession. See Secede.]
1. The act of seceding; separation from fellowship or association with others, as in a religious or political organization; withdrawal.
2. (U.S. Hist.)
The withdrawal of a State from the national Union. Secession Church (in Scotland). See Seceder.
Shades of meaning
Fernald lists secession only as an antonym, under alliance.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given