Source : Webster's Revised Unabridged Dictionary (1913)

Agility \A*gil"i*ty\, n. [F. agili['e], L. agilitas, fr.
   agilis.]
   1. The quality of being agile; the power of moving the limbs
      quickly and easily; nimbleness; activity; quickness of
      motion; as, strength and agility of body.

            They . . . trust to the agility of their wit.
                                                  --Bacon.

            Wheeling with the agility of a hawk.  --Sir W.
                                                  Scott.

   2. Activity; powerful agency. [Obs.]

            The agility of the sun's fiery heat.  --Holland.

Source : WordNet®

agility
     n : the gracefulness of a person or animal that is quick and
         nimble [syn: {legerity}, {lightness}, {lightsomeness}, {nimbleness}]