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

In the United States, demonstrators protested Mr. Trump's immigration crackdown, as well as what some organizers called a sweeping assault on labor protections, diversity initiatives and federal employees. —CBS News, 1 May 2025

Hundreds of demonstrators protested cuts by the Trump administration outside the headquarters of the National Oceanic and Atmospheric Administration on March 3, 2025, in Silver Spring, Md. —Greg Allen, NPR, 25 Apr. 2025

Trump expressed frustration that authorities weren’t taking a more aggressive approach with the demonstrators, comparing the treatment of students to his own interactions with law enforcement. —Dan Alexander, Forbes.com, 17 Apr. 2025

The protests led to tense faceoffs with police at the New York City university and the arrests of more than 100 demonstrators. —Makiya Seminera, Los Angeles Times, 15 Apr. 2025

Word History

Etymology

demonstrate + -or entry 1

First Known Use

1593, in the meaning defined above

Phrases Containing demonstrator

• counter-demonstrator

Rhymes for demonstrator

• activator
• actuator
• agitator
• alligator
• allocator
• alternator
• animator
• annotator
• applicator
• arbitrator
• aspirator
• aviator

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)