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protester (n.)

also protestor, 1540s, protestour, "one who makes solemn affirmation or declaration;" agent noun from protest (v.). From 1960 as "demonstrator against or public opponent of the established order."

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Definitions of protester from WordNet

protester (n.)
a person who dissents from some established policy;
Synonyms: dissenter / dissident / objector / contestant
protester (n.)
someone who participates in a public display of group feeling;
Synonyms: demonstrator
From wordnet.princeton.edu