cohort
Americannoun
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a group or company.
She has a cohort of admirers.
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a companion or associate.
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one of the ten divisions in an ancient Roman legion, numbering from 300 to 600 soldiers.
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any group of soldiers or warriors.
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an accomplice; abettor.
He got off with probation, but his cohorts got ten years apiece.
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a group of persons sharing a particular statistical or demographic characteristic.
the cohort of all children born in 1980.
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Biology. an individual in a population of the same species.
noun
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one of the ten units of between 300 and 600 men in an ancient Roman Legion
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any band of warriors or associates
the cohorts of Satan
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an associate or follower
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biology a taxonomic group that is a subdivision of a subclass (usually of mammals) or subfamily (of plants)
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statistics a group of people with a statistic in common, esp having been born in the same year
Usage
What does cohort mean? A cohort is a group of people, as in The senator is traveling with a large cohort. It can also refer to an associate or companion, as in I’m meeting up with some of my cohorts from my days as a salesperson. Sometimes, cohort refers to an accomplice in crime or some other underhanded activity, as in The supervillain and his cohorts have robbed yet another bank. When referring to a group, cohort can also be used in a more specific way to mean a group of people who share a common characteristic, come from the same demographic, or have been sorted into the same category. In statistical studies, it’s especially used to refer to people born in the same year or range of years, as in This study focuses on the cohort of people born between 1980 and 1985. In education, cohort is used to refer to a group of students, such as one consisting of students who started in the same year, or one of the multiple smaller groups that a class has been divided into.In biology, cohort is used to refer to an individual animal or organism in a population of the same species.
Etymology
Origin of cohort
First recorded in 1475–85; from Middle French cohorte, from Latin cohort- (stem of cohors ) “farmyard, armed force (originally, from a particular place or camp), cohort, retinue,” equivalent to co- “with, together” + hort- (akin to hortus “garden”); replacing late Middle English cohors, from Latin; co-, com-
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.
The researchers examined six randomized controlled trials and 13 prospective cohort studies.
From Science Daily • Mar. 29, 2026
Positive news could trigger big snapbacks from this cohort, as much as $86 billion over the next month if there’s a sustained rally.
From MarketWatch • Mar. 27, 2026
Flipping the telescope to the large end is not unique to this particular cohort, nor is it anything to criticize or demonize.
From Salon • Mar. 24, 2026
Like many of her cohort, it was the first time she had ever left India.
From BBC • Mar. 22, 2026
Erickson and Balee belong to a cohort of scholars that in recent years has radically challenged conventional notions of what the Western Hemisphere was like before Columbus.
From "1491" by Charles C. Mann
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.
