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

Thousands of demonstrators also took to the streets on Friday to protest Israel's presence at the event over the war in Gaza. —Chloe Veltman, NPR, 9 May 2026

Some demonstrators got in several lawmakers' faces. —Terry Collins, USA Today, 8 May 2026

Thousands of demonstrators marched in the streets of Venice on the eve of the public opening of the Venice Biennale on Saturday in protest of Israel’s presence in the show. —Brian Boucher, ARTnews.com, 8 May 2026

The final Senate vote unfolded as demonstrators chanted loudly in the galleries and hallways. —Arkansas Online, 8 May 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)