/ ˈkəʊhɔːt; NAmE ˈkoʊhɔːrt/ noun [ C +sing./pl. v . ]
1.
( technical ) a group of people who share a common feature or aspect of behaviour :
the 1999 birth cohort (= all those born in 1999)
2.
( disapproving ) a member of a group of people who support another person :
Robinson and his cohorts were soon ejected from the hall.
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WORD ORIGIN
late Middle English : from Old French cohorte , or from Latin cohors , cohort- yard, retinue. Compare with court .