A group of warriors or followers or, in a clinical trial, a group of study subjects or a group of patients. In Rome, a "cohors" was one of ten divisions making up a Roman legion. The term came via French into English and came to refer to any body of troops and to any group of individuals with something in common.
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1. Component of the population born during a particular period and identified by period of birth so that its characteristics can be ascertained as it enters successive time and age periods. 2. Any designated group followed or traced over a period, as in an epidemiological c. study. [L. cohors, retinue, military unit]

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co·hort 'kō-.hȯ(ə)rt n 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)>

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co·hort (koґhort) [L. cohors one of the ten units making up a Roman legion] 1. in epidemiology, a group of individuals who share a common characteristic, e.g., all of the individuals born in one year (a birth cohort) or a group of individuals entered in a prospective study or a clinical trial. The term always indicates observation of the individuals over time. 2. a taxonomic category approximately equivalent to a division, order, or suborder in various systems of classification.

Medical dictionary. 2011.


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  • cohort — (n.) early 15c., company of soldiers, from M.Fr. cohorte (14c.) and directly from L. cohortem (nom. cohors) enclosure, meaning extended to infantry company in Roman army (a tenth part of a legion) through notion of enclosed group, retinue, from… …   Etymology dictionary

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  • cohort — ► NOUN 1) an ancient Roman military unit, comprising six centuries and equal to one tenth of a legion. 2) a number of people banded together or treated as a group. 3) derogatory, chiefly N. Amer. a supporter or companion. ORIGIN Latin cohors yard …   English terms dictionary

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  • cohort — /koh hawrt/, n. 1. a group or company: She has a cohort of admirers. 2. a companion or associate. 3. one of the ten divisions in an ancient Roman legion, numbering from 300 to 600 soldiers. 4. any group of soldiers or warriors. 5. an accomplice;… …   Universalium

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