co·​hort | \ ˈkō-ˌhȯrt How to pronounce cohort (audio) \

Definition of cohort

1 : companion, colleague a few of their … cohorts decided to form a company— Burt Hochberg
2a : band, group a cohort of supporters
b : a group of individuals having a statistical factor (such as age or class membership) in common in a demographic study a cohort of premedical students the cohort of people born in the 1980s
c : one of 10 divisions of an ancient Roman legion
d : a group of warriors or soldiers

Did you know?

In ancient times, a cohort was a military unit, one of ten divisions in a Roman legion. The term passed into English in the 15th century, when it was used in translations and writings about Roman history. Once cohort became established in our language, its meaning was extended, first to refer to any body of troops, then to any group of individuals with something in common, and later to a single companion. Some usage commentators have objected to this last sense because it can be hard to tell whether the plural refers to different individuals or different groups. The "companion" sense is well established in standard use, however, and its meaning is clear enough in such sentences as "her cohorts came along with her to the game."

Examples of cohort in a Sentence

The police arrested the gang's leader and his cohorts. Depression was a common problem for people in that age cohort.
Recent Examples on the Web There may be a cohort of patients whose care lies between emergency observation and full admission. Stephen Bohan, STAT, 2 Aug. 2022 Male students were two to three times likelier to be in the top-performing tier of their cohort. Amy Glynn, Forbes, 15 July 2022 That's in part because of the size of their cohort, about 66 million. NBC News, 6 Apr. 2022 One of my good friends and member of my same cohort at MIT was the first Rwandan to go to MIT. Ciku Kimeria, Quartz, 6 Apr. 2022 Like many of his cohort, producer Rosario Rinaldo, head of TV production company Cross Prods. Nick Vivarelli, Variety, 2 Apr. 2022 Older millennials, born before 1989, make up a larger share of new homeowners than younger members of their cohort. Tristan Bove, Fortune, 24 Mar. 2022 As a result of our first playwriting cohort, two of our workshop participants were commissioned by the Old Globe to write plays for the Powers New Voices Festival, an annual play festival that showcases works by new playwrights. San Diego Union-Tribune, 1 Jan. 2022 Didion started out a Goldwater Republican and ended up one of her cohort’s keenest champions of the social pact. Nathan Heller, The New Yorker, 23 Dec. 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cohort.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of cohort

15th century, in the meaning defined at sense 2c

History and Etymology for cohort

Middle English, from Latin cohort-, cohors — more at court

Learn More About cohort

Time Traveler for cohort

Time Traveler

The first known use of cohort was in the 15th century

See more words from the same century

Listen to Our Podcast About cohort

Dictionary Entries Near cohort




See More Nearby Entries 

Statistics for cohort

Last Updated

7 Aug 2022

Cite this Entry

“Cohort.” Dictionary, Merriam-Webster, Accessed 17 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for cohort


co·​hort | \ ˈkō-ˌhȯ(ə)rt How to pronounce cohort (audio) \

Medical Definition of cohort

: a group of individuals having a statistical factor (as age or risk) in common the population consisted of two cohorts: 204 clearly exposed and 163 not exposed— R. R. Suskind et al.

More from Merriam-Webster on cohort

Nglish: Translation of cohort for Spanish Speakers

Britannica English: Translation of cohort for Arabic Speakers


Test Your Vocabulary

Words Named After People

  • name tags
  • Namesake of the leotard, Jules Léotard had what profession?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!