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

Around 15 people demonstrators participated in the Thursday protest for about an hour, the Sacramento Bee reported. —Anthony Robledo, USA Today, 20 Sep. 2025

Protests outside the Broadview facility continued midday Friday, with a handful of demonstrators holding up signs and cellphones toward a fence topped with barbed wire, video from the scene shows. —Alisha Ebrahimji, CNN Money, 19 Sep. 2025

The charges are linked to when the demonstrators barricaded themselves inside university offices last year during a campus protest demanding that Stanford divest from companies linked to Israel’s military campaign in Gaza. —Ryan MacAsero, Mercury News, 18 Sep. 2025

Violence occurred during Seattle May Day protests in 2016, with anarchist groups and other demonstrators clashing with police. —Jonathan M. Gitlin, ArsTechnica, 18 Sep. 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)