Source : Webster's Revised Unabridged Dictionary (1913)

Subcontract \Sub*con"tract\, n.
   A contract under, or subordinate to, a previous contract.

Source : WordNet®

subcontract
     n : a contract assigning to another party some obligations of a
         prior contract

subcontract
     v 1: arranged for contracted work to be done by others [syn: {farm
          out}, {job}]
     2: work under a subcontract; engage in a subcontract