Meaning

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

noun someone who demonstrates an article to a prospective buyer

noun someone who participates in a public display of group feeling

originEtymology tree Proto-Indo-European *de Proto-Indo-European *-h₁ Proto-Indo-European *déh₁ Proto-Italic *dē Latin dē Latin dē- Proto-Indo-European *men- Proto-Indo-European *-yeti Proto-Indo-European *-éyeti Proto-Indo-European *monéyeti Proto-Italic *moneō Proto-Indo-European *-tḗr Proto-Indo-European *-trom Proto-Italic *-trom Proto-Italic *monestrom Latin mōnstrum Proto-Indo-European *-h₂…

Etymology from Wiktionary, CC BY-SA 3.0