Source : Webster's Revised Unabridged Dictionary (1913)

Hybridization \Hy`brid*i*za"tion\, n.
   The act of hybridizing, or the state of being hybridized.

Source : WordNet®

hybridization
     n : (genetics) the act of mixing different species or varieties
         of animals or plants and thus to produce hybrids [syn: {hybridisation},
          {crossbreeding}, {crossing}, {cross}, {interbreeding}, {hybridizing}]