The Collaborative International Dictionary of English v.0.48:

Supervene \Su`per*vene"\, v. i. [imp. & p. p. Supervened; p.
   pr. & vb. n. Supervening.] [L. supervenire, superventum, to
   come over, to come upon; super over + venire to come. See
   Super-, and Come, and cf. Overcome.]
   To come as something additional or extraneous; to occur with
   reference or relation to something else; to happen upon or
   after something else; to be added; to take place; to happen.
   [1913 Webster]

         Such a mutual gravitation can never supervene to matter
         unless impressed by divine power.        --Bentley.
   [1913 Webster]

         A tyrany immediately supervened.         --Burke.
   [1913 Webster]

WordNet (r) 3.0 (2006):

supervene
    v 1: take place as an additional or unexpected development