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

 

instigator

 noun
noun
BrE BrE//ˈɪnstɪɡeɪtə(r)//
 
; NAmE NAmE//ˈɪnstɪɡeɪtər//
 
 
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instigator (of something) a person who causes something to happen, especially something bad the instigators of the riots
See the Oxford Advanced American Dictionary entry: instigator