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

In a voice note sent by the second Tehran resident on Wednesday night, the sound of pro-regime demonstrators who had gathered for the first day of official mourning for Khamenei can be heard chanting in the background. —Kara Fox, CNN Money, 6 Mar. 2026

The mission, called Cassowary Vex, sent the DART AE demonstrator into a suborbital flight aboard Rocket Lab’s HASTE vehicle. —Aamir Khollam, Interesting Engineering, 4 Mar. 2026

The demonstrators voiced deep concern over the company's expanding influence and footprint in the technology sector. —Anna McAllister, CBS News, 4 Mar. 2026

The friction boiled over last month during the bill’s debate in the lower house of Congress, as the GCT launched a 24-hour nationwide strike, while demonstrators from various leftist groups clashed with police outside Congress. —ABC News, 2 Mar. 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)