Synonyms of secession in English:

secession


See US English definition of secession

See UK English definition of secession

See Spanish definition of secesión

noun

1‘the republic's secession from the Soviet Union’

SYNONYMS
withdrawal, break, breakaway, separation, severance, schism, apostasy, leaving, quitting, split, splitting, disaffiliation, resignation, pulling out, dropping out, desertion, defection
ANTONYMS

joining, unification