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

 

agitator

 noun
noun
BrE BrE//ˈædʒɪteɪtə(r)//
 
; NAmE NAmE//ˈædʒɪteɪtər//
 
(disapproving) Protest
 
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a person who tries to persuade people to take part in political protest a known agitator and troublemaker See related entries: Protest Word Origin mid 17th cent. (denoting a delegate of private soldiers in the Parliamentary army during the English Civil War): from Latin, from agitare, frequentative of agere ‘do, drive’. The current sense dates from the mid 18th cent.
See the Oxford Advanced American Dictionary entry: agitator