Etymology
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demonstrator (n.)

1610s, "one who points out or proves," agent noun in Latin form from demonstrate. From 1680s as "one who uses specimens or experiments as a method of teaching;" 1870 as "one who participates in public demonstrations."

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Definitions of demonstrator

demonstrator (n.)
a teacher or teacher's assistant who demonstrates the principles that are being taught;
demonstrator (n.)
someone who demonstrates an article to a prospective buyer;
Synonyms: sales demonstrator
demonstrator (n.)
someone who participates in a public display of group feeling;
Synonyms: protester
From wordnet.princeton.edu