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demonstrator
noun
dem·on·stra·tor ˈde-mən-ˌstrā-tər 
: 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
Example Sentences
Thousands of demonstrators marched through the streets.
Recent Examples on the Web The police arrested another demonstrator, 23-year-old Juliana Bernado, on suspicion of resisting arrest after she was accused of trying to grab an officer’s baton, according to the LAPD. 
Paul Pringlestaff Writer, Los Angeles Times, 26 June 2022 In March, a Premier League soccer match was halted when a demonstrator tied himself to one of the goal posts. CNN, 5 July 2022 In the demonstrator plane, much of the space inside the cabin is currently taken up by testing stations, along with huge water tanks used to balance the aircraft during test conditions. Tamara Hardingham-gill, CNN, 27 July 2022 Right at the beginning was Myst, a foundational work for gaming and an early demonstrator of what CD-ROMs and PCs could deliver. PCMAG, 27 July 2022 The feat was achieved last Thursday with Ampaire’s EEL demonstrator plane. Rachel Cormack, Robb Report, 26 July 2022 The company unveiled its XB-1 tech demonstrator in 2021, and though the plane hasn’t flown yet, is already pushing ahead to develop the next aircraft, Overture. Kyle Mizokami, Popular Mechanics, 20 July 2022 On this theme, Amazon has recently opened its first Amazon Style store, which is a demonstrator of several new real-world retail technologies. Bernard Marr, Forbes, 1 July 2022 In her speech to the crowd, attorney and demonstrator Pratt Austin-Trucks, had words for Collins. al, 26 June 2022 See More
Paul Pringlestaff Writer, Los Angeles Times, 26 June 2022 In March, a Premier League soccer match was halted when a demonstrator tied himself to one of the goal posts. CNN, 5 July 2022 In the demonstrator plane, much of the space inside the cabin is currently taken up by testing stations, along with huge water tanks used to balance the aircraft during test conditions. Tamara Hardingham-gill, CNN, 27 July 2022 Right at the beginning was Myst, a foundational work for gaming and an early demonstrator of what CD-ROMs and PCs could deliver. PCMAG, 27 July 2022 The feat was achieved last Thursday with Ampaire’s EEL demonstrator plane. Rachel Cormack, Robb Report, 26 July 2022 The company unveiled its XB-1 tech demonstrator in 2021, and though the plane hasn’t flown yet, is already pushing ahead to develop the next aircraft, Overture. Kyle Mizokami, Popular Mechanics, 20 July 2022 On this theme, Amazon has recently opened its first Amazon Style store, which is a demonstrator of several new real-world retail technologies. Bernard Marr, Forbes, 1 July 2022 In her speech to the crowd, attorney and demonstrator Pratt Austin-Trucks, had words for Collins. al, 26 June 2022 See More Word History
Etymology
First Known Use
1611, in the meaning defined above
Time Traveler
The first known use of demonstrator was in 1611 Phrases Containing demonstrator
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