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

Rubber bullets, pepper balls and tear gas have been fired at demonstrators, while employees of the facility have sought escorts into the building and had their tires slashed, according to court papers. —Ella Lee, The Hill, 23 Dec. 2025

In the summer of 1989, for instance, a group of Amnesty International members gathered at the site to protest the killing of student demonstrators in China. —Miami Herald Archives, Miami Herald, 22 Dec. 2025

There were no counter-demonstrators observed at this rally. —Elizabeth Marie Himchak, San Diego Union-Tribune, 22 Dec. 2025

In Downers Grove, a few hundred demonstrators rallied outside a hotel after spotting Department of Homeland Security vehicles in the parking lot and suspecting ICE agents were lodging there. —Nandika Chatterjee, Time, 19 Dec. 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)