Source : Webster's Revised Unabridged Dictionary (1913)

Quota \Quo"ta\, n. [LL., fr. L. quota (sc. pars), fr. quotus
   which or what in number, of what number, how many, fr. quot
   how many, akin to quis, qui, who: cf. It. quota a share. See
   {Who}.]
   A proportional part or share; the share or proportion
   assigned to each in a division. ``Quota of troops and
   money.''

Source : WordNet®

quota
     n 1: a prescribed number; "all the salesmen met their quota for
          the month"
     2: a proportional share assigned to each participant
     3: a limitation on imports; "the quota for Japanese imports was
        negotiated"