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 39-year-old uniformed officer was monitoring the protest at Union Square Park at 8:15 p.m. Thursday when a masked demonstrator approached and shoved the metal barrier into the cop’s face. —Kerry Burke, New York Daily News, 16 May 2025

There’s a big contrast between the demonstrators who were sentenced immediately on the spot the day after the arrest; they were often sentenced to several months in prison. —Anthony D'alessandro, Deadline, 16 May 2025

This year in Basel, demonstrators were highly visible at the opening ceremony of the contest, with large Palestinian flags being waved in the crowd. —Andrew Jones, NBC news, 15 May 2025

She’s already encountered some of that resistance when demonstrators shouted at her and flew Palestinian flags during Sunday’s turquoise carpet event in Basel, Switzerland, where this year’s edition is being held. —Gil Kaufman, Billboard, 13 May 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)