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.

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. 2014.
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World English Dictionary
cohort (ˈkəʊhɔːt)
1.  one of the ten units of between 300 and 600 men in an ancient Roman Legion
2.  any band of warriors or associates: the cohorts of Satan
3.  chiefly (US) an associate or follower
4.  biology a taxonomic group that is a subdivision of a subclass (usually of mammals) or subfamily (of plants)
5.  statistics a group of people with a statistic in common, esp having been born in the same year
[C15: from Latin cohors yard, company of soldiers; related to hortus garden]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1422, from L. cohortem, acc. of 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" + root akin to hortus "garden," from PIE *ghr-ti-, from base *gher- "to grasp, enclose" (see
yard (1)). Sense of "accomplice" is first recorded 1952, Amer.Eng.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences
We know that they make up the largest population cohort in history.
Teenage pregnancy and adverse birth outcomes: a large population based
  retrospective cohort study.
Most universities limit the number of courses a single candidate can teach in
  order to protect the full-time cohort.
The same thing happened to me, but my advisor told me that all of her advisees
  in my cohort were contacted.
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