Source : Webster's Revised Unabridged Dictionary (1913)

Defloration \Def`lo*ra"tion\, n. [LL. defloratio: cf. F.
   d['e]floration.]
   1. The act of deflouring; as, the defloration of a virgin.
      --Johnson.

   2. That which is chosen as the flower or choicest part;
      careful culling or selection. [R.]

            The laws of Normandy are, in a great measure, the
            defloration of the English laws.      --Sir M. Hale.

Source : WordNet®

defloration
     n 1: an act that despoils the innocence or beauty of something
     2: the act of depriving a woman of her virginity (especially by
        rupturing the hymen through sexual intercourse)