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.
Vocabulary lists containing demonstrator
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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.
"We intend to reach the stadium," demonstrator Angel Villalobos told AFP on Tuesday.
From Barron's • Jun. 9, 2026
Its Mark 1 demonstrator was already in final stacking in Florida, while SpaceX's Starship has yet to complete a successful in-space propellant transfer.
From BBC • May 29, 2026
Another demonstrator told the BBC she had been arrested 10 times before and expected the same outcome.
From BBC • Apr. 11, 2026
"Let's decolonise technology," one demonstrator had written on a sign.
From Barron's • Mar. 2, 2026
“We considered taking a stand, being arrested and going to jail to be an event that instilled the utmost pride,” one student demonstrator explained.
From "Because They Marched" by Russell Freedman
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.
