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

Avalanche has already built its technology demonstrators but has not yet achieved a net-positive energy gain. —Ameya Paleja, Interesting Engineering, 9 Apr. 2026

Two deputies watched the demonstrators. —ABC News, 8 Apr. 2026

Many of the thousands of demonstrators taking to the streets brandished weapons including guns and daggers, while others waved Lebanese, Palestinian, Iranian and Hezbollah flags. —Billy Stockwell, CNN Money, 5 Apr. 2026

According to a recent news release from ISP, the demonstrators were using whistles and bullhorns, then gathered in a bathroom. —Shannon Tyler, Idaho Statesman, 4 Apr. 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)