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English word demonstrate comes from Latin monstro, and later Latin demonstrare ("be thou shown; be thou proven". "to show; to prove".)
monstro (Latin)
I advise, teach. I appoint, ordain.. I denounce, indict.. I show, point out, indicate.
demonstrare (Latin)
"be thou shown; be thou proven". "to show; to prove".
demonstrate (English)
To display the method of using an object.. To participate in or organize a demonstration.. To show the steps taken to create a logical argument or equation.. To show, display, present.