demonstrator
Americannoun
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a person or thing that demonstrates.
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Also a person who takes part in a public demonstration, as by marching or picketing.
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a person who explains orteaches by practical demonstrations.
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a person who exhibits the use and application of (a product, service, etc.) to a prospective customer.
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the product, device, machine, etc., actually used in demonstrations to purchasers or prospective customers.
They sold the demonstrator at half price.
noun
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a person who demonstrates equipment, machines, products, etc
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a person who takes part in a public demonstration
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a piece of merchandise, such as a car that one test-drives, used to display merits or performance to prospective buyers
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Etymology
Origin of demonstrator
1605–15; < Latin dēmonstrātor, equivalent to dēmonstrā ( re ) ( see demonstrate) + -tor -tor
Explanation
If you participate in a political protest, you are a demonstrator. Demonstrate means to show, and by dint of your presence, you are showing that you agree with the protest message. Demonstrator can also mean someone who demonstrates how something works. Electrolux vacuums were sold by door-to-door salespeople who were also demonstrators––they put horrible messes down on the rug to demonstrate their vacuum's power.
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Another demonstrator told the BBC she had been arrested 10 times before and expected the same outcome.
From BBC • Apr. 11, 2026
The jury was shown a video of a demonstrator blocking the minister's car with Wai sitting in the front passenger seat.
From BBC • Mar. 23, 2026
The space launch and technology provider said it had successfully launched its Alpha Flight 7 mission on Wednesday, delivering a demonstrator payload for defense company Lockheed Martin.
From Barron's • Mar. 12, 2026
“We’re thrilled,” said demonstrator Shawn Araghi, who left Iran as an 8-year-old when Shah Mohammad Reza Pahlavi was ousted in 1979.
From Los Angeles Times • Mar. 1, 2026
Often I was at meetings all night and would sleep all day — not the normal schedule of an agricultural demonstrator.
From "Long Walk to Freedom" by Nelson Mandela
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
