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

Meanwhile, smoke hung in the air near the scene late into the evening as officers deployed multiple tear gas canisters on demonstrators, with one striking CNN correspondent Whitney Wild. —Danya Gainor, CNN Money, 15 Jan. 2026

Videos have shown tense standoffs between demonstrators and immigration agents. —Christopher Cann, USA Today, 15 Jan. 2026

Things later quietened down and by early Thursday only a few demonstrators and law enforcement officers remained at the scene. —Steve Karnowski, Chicago Tribune, 15 Jan. 2026

Against the backdrop of demonstrators’ horns and whistles, Good partially blocked traffic with her SUV on a one-way residential street lined with snow. —Danielle Bacher, PEOPLE, 15 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)