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

Wet weather wasn't going to stop demonstrators from filling San Jose's Mexican Heritage Plaza to make sure their voices were heard. —Amanda Hari, CBS News, 5 Jan. 2026

The protests, taking root in economic issues, have heard demonstrators chant against Iran’s theocracy as well. —Jon Gambrell, Los Angeles Times, 3 Jan. 2026

In Bogotá, Colombia, demonstrators cheered the United States on Saturday at a rally in the city's center. —Sandra Lilley, NBC news, 3 Jan. 2026

Some demonstrators toppled statues of Chávez. —Dallas Morning News, 3 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)