Definition of defection noun from the Oxford Advanced Learner's Dictionary



BrE BrE//dɪˈfekʃn//
; NAmE NAmE//dɪˈfekʃn//
[uncountable, countable]defection (from A) (to B)
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the act of leaving a political party, country, etc. to join another that is considered to be an enemy There have been several defections from the ruling party.