noun

1. an ancient Roman military unit of 300-600 men, constituting one tenth of a legion
2. a band of soldiers
3. any group or band
4. an associate, colleague, or supporter one of the mayor's cohorts
5. a conspirator or accomplice
6. a subgroup sharing a common factor in a statistical survey, as age or income level

Etymology: ME < L cohors, enclosure, enclosed company, hence, retinue, crowd < co-, co- + IE *ĝhṛtis, a gathering < base *ĝher-, to grasp, enclose > yard