Source : Webster's Revised Unabridged Dictionary (1913)

Plasticity \Plas*tic"i*ty\, n. [Cf. F. plasticit['e].]
   1. The quality or state of being plastic.

   2. (Physiol.) Plastic force. --Dunglison.

Source : WordNet®

plasticity
     n : the property of being physically malleable; the property of
         something that can be worked or hammered or shaped under
         pressure without breaking [syn: {malleability}] [ant: {unmalleability}]