Definition of secede verb from the Oxford Advanced American Dictionary

 

secede

 verb
verb
NAmE//sɪˈsid//
 
[intransitive]secede (from something)(formal)Verb Forms present simple I / you / we / they secede
 
he / she / it secedes
 
past simple seceded
 
-ing form seceding
 
 
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(of a state, country, etc.) to officially leave an organization of states, countries, etc. and become independent The Republic of Panama seceded from Colombia in 1903.
See the Oxford Advanced Learner's Dictionary entry: secede