Cohort

[koh-hawrt] /ˈkoʊ hɔrt/

noun
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; abettor:
He got off with probation, but his cohorts got ten years apiece.
6.
a group of persons sharing a particular statistical or demographic characteristic:
the cohort of all children born in 1980.
7.
Biology. an individual in a population of the same species.
/ˈkəʊhɔːt/
noun
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.
(mainly 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
n.

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).

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