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

Instead of a total mask ban, for example, masked demonstrators would be required to show identification when asked. —New York Times, 25 July 2025

Dozens of demonstrators occupied a room in Butler Library during the May protest, as students were studying for their final exams. —Matt Lavietes, NBC news, 23 July 2025

Now, the project is moving to Phase 2, which includes producing a full, detailed design, construction of a prototype, ground testing, certification of the demonstrator, and flight testing. —New Atlas, 13 July 2025

Authorities in military-style gear faced off with demonstrators amid billowing smoke. —Adeola Adeosun, MSNBC Newsweek, 13 July 2025

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)