The Collaborative International Dictionary of English v.0.48:

Devolution \Dev`o*lu"tion\, n. [LL. devolutio: cf. F.
   d['e]volution.]
   1. The act of rolling down. [R.]
      [1913 Webster]

            The devolution of earth down upon the valleys.
                                                  --Woodward.
      [1913 Webster]

   2. Transference from one person to another; a passing or
      devolving upon a successor.
      [1913 Webster]

            The devolution of the crown through a . . . channel
            known and conformable to old constitutional
            requisitions.                         --De Quincey.
      [1913 Webster]

WordNet (r) 3.0 (2006):

devolution
    n 1: the process of declining from a higher to a lower level of
         effective power or vitality or essential quality [syn:
         degeneration, devolution] [ant: development,
         evolution]
    2: the delegation of authority (especially from a central to a
       regional government) [syn: devolution, devolvement]