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

 

defector

 noun
noun
BrE BrE//dɪˈfektə(r)//
 
; NAmE NAmE//dɪˈfektər//
 
defector (from A) (to B)
 
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a person who leaves a political party, country, etc. to join another that is considered to be an enemy a Soviet defector to Canada in 1946