dem·​on·​stra·​tor | \ˈde-mən-ˌstrā-tər \

Definition of demonstrator 

: one that demonstrates:

a : a product (such as an automobile) used to demonstrate performance or merits to prospective buyers

b : a person who engages in a public demonstration

Examples of demonstrator in a Sentence

Thousands of demonstrators marched through the streets.

Recent Examples on the Web

The space agencies are aiming to launch a first demonstrator test flight in Kourou, French Guiana, in 2021. Eric Berger, Ars Technica, "Rocket Report: Scotland’s NIMBY problem, SpaceX test firing, Soyuz mishap," 2 Nov. 2018 And these officers violently attacked demonstrators with their batons and tear gas, intending to intimidate the people from moving forward in their protests. Danielle Corcione, Teen Vogue, "How the Democratic National Convention Has Been Protested Against in the Last 50 Years," 28 Aug. 2018 Eleven people have died in two days of clashes with police there as demonstrators demand the closure of a Sterlite copper-smelting plant. CNN, "Indian court halts expansion of copper plant after deadly protests," 23 May 2018 Meanwhile, Antifa demonstrators and students also protested when conservative commentator Ben Shapiro made an appearance, costing the school another $600,000. Caleb Parke, Fox News, "UC-Berkeley police were asked not to use student restrooms during Milo protest: officer," 2 Oct. 2018 Police had expected at least 10,000 demonstrators and recruited reinforcements from around the country, forcing the nearby city of Dresden to cancel a popular soccer match and divert police to Chemnitz instead. William Boston, WSJ, "German City Braces for a Night of Anti-Immigration Protests," 1 Sep. 2018 Interviews with editors and reporters at several outlets detailed pressure to avoid covering the Pashtun movement as an unmistakable sign that both the demonstrators and the press are facing a new level of threat from the military. Meher Ahmad, New York Times, "‘Our First Mistake Will Be Our Last’: Pakistani Rights Movement Defies Army," 17 Apr. 2018 Palestinian demonstrators ran for cover from Israeli fire and tear gas during a protest on May 14, the most violent day in weeks of demonstrations. Felicia Schwartz, WSJ, "Israel and Hamas Take Steps to Avoid War After Violent Cycle," 7 June 2018 Pro-Palestinian demonstrators in Philadelphia had likewise disrupted a May 19 performance of Tosca at the Kimmel Center as a sendoff just before the tour. David Patrick Stearns,, "Adoring Vienna sees Philadelphia Orchestra off to Israel, with no disruptions since Brussels," 1 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'demonstrator.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of demonstrator

1611, in the meaning defined above

History and Etymology for demonstrator

demonstrate + -or entry 1

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Last Updated

4 Dec 2018

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Time Traveler for demonstrator

The first known use of demonstrator was in 1611

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English Language Learners Definition of demonstrator

: a person who is part of an event in which people gather together in order to show that they support or oppose something or someone : a person who participates in a demonstration

: a person who shows other people how something is used or done


dem·​on·​stra·​tor | \ˈde-mən-ˌstrā-tər \

Kids Definition of demonstrator

1 : a person who makes or takes part in a demonstration

2 : a manufactured article (as an automobile) used for demonstration


dem·​on·​stra·​tor | \ˈdem-ən-ˌstrāt-ər \

Medical Definition of demonstrator 

: a teacher or teacher's assistant who demonstrates principles or theories studied (as by dissection, experiment, or chemical preparation)

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More from Merriam-Webster on demonstrator

Rhyming Dictionary: Words that rhyme with demonstrator

Spanish Central: Translation of demonstrator

Nglish: Translation of demonstrator for Spanish Speakers

Britannica English: Translation of demonstrator for Arabic Speakers

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What made you want to look up demonstrator? Please tell us where you read or heard it (including the quote, if possible).


the figure or shape of a crescent moon

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