The Collaborative International Dictionary of English v.0.48:

Disobey \Dis`o*bey"\, v. t. [imp. & p. p. Disobeyed; p. pr. &
   vb. n. Disobeying.] [F. d['e]sob['e]ir; pref. d['e]s- (L.
   dis-) + ob['e]ir. See Obey, and cf. Disobedient.]
   Not to obey; to neglect or refuse to obey (a superior or his
   commands, the laws, etc.); to transgress the commands of (one
   in authority); to violate, as an order; as, refractory
   children disobey their parents; men disobey their Maker and
   the laws.
   [1913 Webster]

         Not to disobey her lord's behest.        --Tennyson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Disobey \Dis`o*bey"\, v. i.
   To refuse or neglect to obey; to violate commands; to be
   disobedient.
   [1913 Webster]

         He durst not know how to disobey.        --Sir P.
                                                  Sidney.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disobey
    v 1: refuse to go along with; refuse to follow; be disobedient;
         "He disobeyed his supervisor and was fired" [ant: obey]

The Devil's Dictionary (1881-1906):

DISOBEY, v.t.  To celebrate with an appropriate ceremony the maturity
of a command.

    His right to govern me is clear as day,
    My duty manifest to disobey;
    And if that fit observance e'er I shut
    May I and duty be alike undone.
                                                         Israfel Brown