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

He's spoken passionately against the ongoing crackdown of demonstrators in his home country. —Jake Coyle The Associated Press, Arkansas Online, 23 Jan. 2026

The woman's death has since sparked a series of protests in the midwestern city, as well as clashes between federal agents and demonstrators. —Edward Segarra, USA Today, 22 Jan. 2026

Video footage from the protest showed officers swinging batons and knocking demonstrators to the ground. —Los Angeles Times, 22 Jan. 2026

The filmmakers’ delight with the nomination was tempered by alarm over the current situation in Iran, where the government has used deadly force to put down recent street protests – killing more than 3,000 demonstrators. —Matthew Carey, Deadline, 22 Jan. 2026

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)