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

Protesters rallied for hours Tuesday outside the courthouse, with WCCO crews witnessing law enforcement use non-lethal or less-lethal munitions against demonstrators, including both tear gas and pepper spray. —Anthony Bettin, CBS News, 16 June 2026

The Islamic Republic has slaughtered demonstrators at random before. —Laura Secor, The Atlantic, 16 June 2026

There have been previous protests at G7 gatherings over the years, with many demonstrators using the summits to speak out against capitalism, globalization, climate change and inequality. —Landon Mion, FOXNews.com, 15 June 2026

Seth Mazibuko, a survivor, remembers vividly how students fought back against the police, who were using tear gas to try and disperse the defiant demonstrators. —ABC News, 15 June 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)