The Collaborative International Dictionary of English v.0.48:

Delegation \Del`e*ga"tion\, n. [L. delegatio: cf. F.
   d['e]l['e]gation.]
   1. The act of delegating, or investing with authority to act
      for another; the appointment of a delegate or delegates.
      [1913 Webster]

   2. One or more persons appointed or chosen, and commissioned
      to represent others, as in a convention, in Congress,
      etc.; the collective body of delegates; as, the delegation
      from Massachusetts; a deputation.
      [1913 Webster]

   3. (Rom. Law) A kind of novation by which a debtor, to be
      liberated from his creditor, gives him a third person, who
      becomes obliged in his stead to the creditor, or to the
      person appointed by him. --Pothier.
      [1913 Webster]

WordNet (r) 3.0 (2006):

delegation
    n 1: a group of representatives or delegates [syn: deputation,
         commission, delegation, delegacy, mission]
    2: authorizing subordinates to make certain decisions [syn:
       delegating, delegation, relegating, relegation,
       deputation]

The Devil's Dictionary (1881-1906):

DELEGATION, n.  In American politics, an article of merchandise that
comes in sets.