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

Soliman is charged in connection with a fatal firebomb attack in Colorado and is accused of throwing two Molotov cocktails at demonstrators who were calling for the release of Israeli hostages in Gaza. —Mike Hixenbaugh, NBC news, 16 Apr. 2026

Bovino’s forces repeatedly fired tear gas canisters and rubber bullets at the heads and faces of demonstrators and journalists. —A.c. Thompson, ProPublica, 14 Apr. 2026

On the other side of the country, police clashed with demonstrators to reopen the Galway docks after a military vehicle was used to knock down a makeshift barrier. —Brian Melley, Fortune, 13 Apr. 2026

On the other side of the country, police clashed with demonstrators to reopen the Galway docks after a military vehicle was used to knock down a makeshift barrier. —ABC News, 12 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)