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

However, a hydrogen-electric hybrid conversion of an S4 demonstrator in 2024 achieved a non-stop flight of 561 miles (903 km). —New Atlas, 22 Nov. 2025

In fact, demonstrators were already holding an anti-ICE rally outside the courthouse to protest ICE activity at courthouses and in support of virtual court hearings, for which immigrants would not need to be physically present, reducing their exposure to ICE activity. —Taylor Galgano Caroll Alvarado, CNN Money, 22 Nov. 2025

Sirens blared through a chaotic day as Chicago police responded to a Border Patrol call for help and confronted demonstrators. —CBS News, 21 Nov. 2025

The chaotic confrontation in Dearborn, Michigan, on Tuesday—when a demonstrator attempted to burn a Qur'an and Muslim counter-protesters surged—was more than a brief flash of drama. —MSNBC Newsweek, 21 Nov. 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)