Source : Webster's Revised Unabridged Dictionary (1913)

Bastardy \Bas"tar*dy\, n.
   1. The state of being a bastard; illegitimacy.

   2. The procreation of a bastard child. --Wharton.

Source : WordNet®

bastardy
     n : the status of being born to parents who were not married
         [syn: {illegitimacy}, {bar sinister}]