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

This test flight also delivered a demonstrator payload for @LockheedMartin. —Josh Dinner, Space.com, 12 Mar. 2026

The women recently organized a rally in downtown Fort Lauderdale where about 150 demonstrators showed up, chanting Pahlavi’s name and waving flags from Iran, Israel and the United States. —Miami Herald, 12 Mar. 2026

The dozens of demonstrators who signed up to give their public comment had to wait outside. —Eleanor Nash, Kansas City Star, 11 Mar. 2026

Lawmakers listened and asked questions while demonstrators outside displayed signs and waved flags. —Christopher Keating, Hartford Courant, 11 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)