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

The vehicle was a suborbital technology demonstrator, climbing to an altitude of roughly 54 miles (88 km) before falling back to Earth. — Sharmila Kuthunur, Space.com, 13 July 2026

Some demonstrators had gathered in the city within hours of the shooting. — ABC News, 13 July 2026

The company plans to deploy these resources toward the engineering, manufacturing, and hardware scaling necessary to build its net-energy stellarator demonstrator, named Alpha. — Aman Tripathi, Interesting Engineering, 11 July 2026

Witnesses said Taliban forces opened fire on demonstrators, killing at least one person. — Fatima Faizi, NPR, 10 July 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)