Source : Webster's Revised Unabridged Dictionary (1913)

Ambidexterity \Am"bi*dex*ter"i*ty\, n.
   1. The quality of being ambidextrous; the faculty of using
      both hands with equal facility. Hence: Versatility;
      general readiness; as, ambidexterity of argumentation.
      --Sterne.

            Ignorant I was of the human frame, and of its latent
            powers, as regarded speed, force, and ambidexterity.
                                                  --De Quincey.

   2. Double-dealing. (Law) A juror's taking of money from the
      both parties for a verdict.

Source : WordNet®

ambidexterity
     n : the property of being equally skillful with each hand [syn:
         {ambidextrousness}]