Source : Webster's Revised Unabridged Dictionary (1913)

Contumacy \Con"tu*ma*cy\, n.; pl. {Contumacies}. [L. contumacia,
   fr. contumax, -acis, insolent; prob. akin to contemnere to
   despise: cf. F. contumace. Cf. {Contemn}.]
   1. Stubborn perverseness; pertinacious resistance to
      authority.

            The bishop commanded him . . . to be thrust into the
            stocks for his manifest and manifold contumacy.
                                                  --Strype.

   2. (Law) A willful contempt of, and disobedience to, any
      lawful summons, or to the rules and orders of court, as a
      refusal to appear in court when legally summoned.

   Syn: Stubbornness; perverseness; obstinacy.

Source : WordNet®

contumacy
     n 1: willful refusal to appear before a court or comply with a
          court order; can result in a finding of contempt of
          court
     2: obstinate rebelliousness and insubordination; resistance to
        authority