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

Proxima is developing stellarator technology, one of a handful of approaches to fusion, and hopes to have its fusion demonstrator — a proof-of-concept precursor to a commercial power plant — up and running in the early 2030s. — Kai Nicol-Schwarz, CNBC, 7 July 2026

Critics say the heightened security presence is intended to deter demonstrators. — ABC News, 6 July 2026

The demonstrators carried American flags, some flown upside down, as well as Confederate flags, as police monitored the event. — Rena Rowe, The Washington Examiner, 6 July 2026

Work begins on JetZero’s first demonstrator This aircraft is intended to prove JetZero’s calculations on aerodynamics, structures, manufacturing, and flight controls. — Christopher McFadden, Interesting Engineering, 5 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)