/ ˈædʒɪteɪtə(r); NAmE / noun
( disapproving ) a person who tries to persuade people to take part in political protest
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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.