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[koh-hawrt] /ˈkoʊ hɔrt/
a group or company:
She has a cohort of admirers.
a companion or associate.
one of the ten divisions in an ancient Roman legion, numbering from 300 to 600 soldiers.
any group of soldiers or warriors.
an accomplice; abettor:
He got off with probation, but his cohorts got ten years apiece.
a group of persons sharing a particular statistical or demographic characteristic:
the cohort of all children born in 1980.
Biology. an individual in a population of the same species.
1475-85; < Middle French cohorte < Latin cohort- (stem of cohors) farmyard, armed force (orig. from a particular place or camp), cohort, retinue, equivalent to co- co- + hort- (akin to hortus garden); replacing late Middle English cohors < L nominative singular
2. friend, comrade, fellow, chum, pal, buddy.
Usage note
A cohort was originally one of the ten divisions of a legion in the Roman army, containing from 300 to 600 men. The most common use of cohort today is in the sense “group” or “company”: A cohort of hangers-on followed the singer down the corridor. In a development emphasizing the idea of companionship, cohort has also come to mean a single companion, associate, or the like: The senator strode into the room followed by his faithful cohort, his son-in-law. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for cohorts
  • Manga followed the tracks until they ended, after which he organized his cohorts into two lines far apart from each other.
  • The trial also failed to detect any difference between the viral load in the two cohorts.
  • None of my cohorts were ever slathered nearly to the degree that my friends slather their kids.
  • Any elections which have been held have been manipulated by the ruling family and their cohorts.
  • They are kept in cohorts until graduation, regardless of individual performance.
  • His power is based on nothing more than the collective respect of his cohorts.
  • Life for his three former cohorts, meanwhile, was less dramatic.
  • They carry the message back to cohorts in the sixteen republics.
  • Still she says nothing and instead tries to get her other two cohorts to make up.
  • Sometimes the victims were cohorts, or best friends.
British Dictionary definitions for cohorts


one of the ten units of between 300 and 600 men in an ancient Roman Legion
any band of warriors or associates: the cohorts of Satan
(mainly US) an associate or follower
(biology) a taxonomic group that is a subdivision of a subclass (usually of mammals) or subfamily (of plants)
(statistics) a group of people with a statistic in common, esp having been born in the same year
Word Origin
C15: from Latin cohors yard, company of soldiers; related to hortus garden
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for cohorts



early 15c., "company of soldiers," from Middle French cohorte (14c.) and directly from Latin cohortem (nominative cohors) "enclosure," meaning extended to "infantry company" in Roman army (a tenth part of a legion) through notion of "enclosed group, retinue," from com- "with" (see co-) + root akin to hortus "garden," from PIE *ghr-ti-, from root *gher- "to grasp, enclose" (see yard (n.1)). Sense of "accomplice" is first recorded 1952, American English, from meaning "group united in common cause" (1719).

Online Etymology Dictionary, © 2010 Douglas Harper
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cohorts in Medicine

cohort co·hort (kō'hôrt')
A defined population group followed prospectively in an epidemiological study.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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