Meaning of “secede” in the English Dictionary

"secede" in British English

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secedeverb [ I ]

uk /sɪˈsiːd/ us /sɪˈsiːd/ formal

to become independent of a country or area of government:

There is likely to be civil war if the region tries to secede from the south.
secession
noun [ U ] uk /sɪsˈeʃ.ən/ us /sɪsˈeʃ.ən/
secessionist
noun [ C ], adjective uk /sɪsˈeʃ.ən.ɪst/ us /sɪsˈeʃ.ən.ɪst/

(Definition of “secede” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"secede" in American English

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secedeverb [ I ]

us /sɪˈsid/

US history to decide not to continue to be part of a larger group or organization:

The American Civil War began when the South seceded from the Union.

(Definition of “secede” from the Cambridge Academic Content Dictionary © Cambridge University Press)