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

Examples of demonstrator in a Sentence

Thousands of demonstrators marched through the streets.

Recent Examples on the Web

American aerospace startup Boom made history on Tuesday by breaking the sound barrier during the test flight of its Boom Supersonic XB-1 demonstrator jet. —Mary Walrath-Holdridge, USA TODAY, 29 Jan. 2025

If all goes well, the piloted demonstrator craft will exceed Mach 1 — the speed of sound — about 25 minutes later. —Mike Wall, Space.com, 28 Jan. 2025

Before long there were protests every day, and demonstrators were staying on the street till evening. —Jon Lee Anderson, The New Yorker, 27 Jan. 2025

President Trump vowed to support antiabortion-rights protesters in his second term as tens of thousands of demonstrators rallied in Washington on Friday. —Gary Fields, Los Angeles Times, 24 Jan. 2025

Word History

Etymology

demonstrate + -or entry 1

First Known Use

1593, in the meaning defined above

Phrases Containing demonstrator

• counter-demonstrator

Kids Definition

demonstrator

noun

dem·​on·​stra·​tor ˈdem-ən-ˌstrāt-ər 

1

: a person who makes or takes part in a demonstration

2

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

Medical Definition

demonstrator

noun

dem·​on·​stra·​tor ˈdem-ən-ˌstrāt-ər 

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