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demonstrator

de·monst·ra·tor

UK/ˈdɛmənstɹeɪtə(ɹ)/ US/ˈdɛmʌˌnstreɪtɜr/ uncommon

noun

1.

a teacher or teacher''s assistant who demonstrates the principles that are being taught

2.

someone who demonstrates an article to a prospective buyer

Synonyms
3.

someone who participates in a public display of group feeling

Synonyms

Origin

From demonstrate + -or.

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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.