A cohort was a sub-division of the Roman infantry, originally of a Roman legion, consisting of 480 men, itself divided in 6 centurias commanded each by a centurion. In the Imperial Roman auxiliary forces individual cohorts of 500 (quingenaria), and 1000 (miliaria), as well as mixed infantry and cavalry units (cohors equitata) existed in parallel.
For the meaning in statistics, see cohort (statistics).
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