Meaning of “demonstrator” in the English Dictionary

(Definition of “demonstrator” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"demonstrator" in American English

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demonstratornoun [ C ]

/ˈdem·ənˌstreɪ·t̬ər/

a person who marches or stands with a group of people to show that they disagree with or support something or someone:

Several demonstrators were arrested when they sat down in the middle of Broadway.

(Definition of “demonstrator” from the Cambridge Academic Content Dictionary © Cambridge University Press)