Source : Webster's Revised Unabridged Dictionary (1913)

Cohort \Co"hort\, n. [L. cohors, prop. an inclosure: cf. F.
   cohorte. See {Court}, n.]
   1. (Rom. Antiq.) A body of about five or six hundred
      soldiers; the tenth part of a legion.

   2. Any band or body of warriors.

            With him the cohort bright Of watchful cherubim.
                                                  --Milton.

   3. (Bot.) A natural group of orders of plants, less
      comprehensive than a class.

Source : WordNet®

cohort
     n 1: a company of companions or supporters
     2: a band of warriors (originally a unit of a Roman Legion)
     3: a group people having approximately the same age [syn: {age
        group}, {age bracket}]