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 fewer than 48 hours, at least 22 people were killed and hundreds injured as demonstrators torched government buildings in the capital Kathmandu and toppled the prime minister. —Kara Fox, CNN Money, 4 Oct. 2025

Rabat has prioritized readying the country to host matches for the 2030 Men’s soccer World Cup at the expense of greater investment in social services, demonstrators say. —Reed Albergotti, semafor.com, 3 Oct. 2025

However, on Thursday night, protesters called for his resignation following the police killing of three demonstrators. —Mandy Taheri, MSNBC Newsweek, 3 Oct. 2025

At the height of the protests the demonstrators stormed and partially burnt the parliament in Nairobi and dozens of protesters were killed. —Emmanuel Akinwotu, NPR, 2 Oct. 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)