The Collaborative International Dictionary of English v.0.48:

Hypocrisy \Hy*poc"ri*sy\ (h[i^]*p[o^]k"r[i^]*s[y^]), n.; pl.
   Hypocrisies (-s[i^]z). [OE. hypocrisie, ypocrisie, OF.
   hypocrisie, ypocrisie, F. hypocrisie, L. hypocrisis, fr. Gr.
   "ypo`krisis the playing a part on the stage, simulation,
   outward show, fr. "ypokr`nesqai to answer on the stage, to
   play a part; "ypo` under + kri`nein to decide; in the middle
   voice, to dispute, contend. See Hypo-, and Critic.]
   The act or practice of a hypocrite; a feigning to be what one
   is not, or to feel what one does not feel; a dissimulation,
   or a concealment of one's real character, disposition, or
   motives; especially, the assuming of false appearance of
   virtue or religion; a simulation of goodness.
   [1913 Webster]

         Hypocrisy is the necessary burden of villainy.
                                                  --Rambler.
   [1913 Webster]

         Hypocrisy is the homage vice pays to virtue. --La
                                                  Rochefoucauld
                                                  (Trans. ).
   [1913 Webster]

WordNet (r) 3.0 (2006):

hypocrisy
    n 1: an expression of agreement that is not supported by real
         conviction [syn: hypocrisy, lip service]
    2: insincerity by virtue of pretending to have qualities or
       beliefs that you do not really have