cooperator
Americannoun
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a person or organization that cooperates with another or others in some action, such as a venture or project.
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a person or organization that practices economic cooperation or participates in a cooperative.
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(often pejorative) a person who cooperates or collaborates with a hostile agency or force.
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
They’ve got one cooperator, but you can cross-examine the cooperator, who’s cooperating in hopes of a more lenient sentence.
From Slate • Jan. 7, 2026
Using a rented minivan, Quintero and the cooperator conducted six “recon” missions in Franco’s neighborhood, Del Rio testified.
From Los Angeles Times • Oct. 10, 2025
"He is not a viable cooperator for the Fulton County D.A.,"
From Salon • Feb. 27, 2024
While Wang is the first cooperator to take the stand, jurors have so far heard from three other witnesses.
From Reuters • Oct. 6, 2023
Auxiliary -- N. auxiliary; recruit; assistant; adjuvant, adjutant; ayudante†, coaid†; adjunct; help, helper, help mate, helping hand; midwife; colleague, partner, mate, confrere, cooperator; coadjutor, coadjutrix†; collaborator. ally; friend &c.
From Roget's Thesaurus of English Words and Phrases by Roget, Peter Mark
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
