Source : Webster's Revised Unabridged Dictionary (1913)

Legerity \Le*ger"i*ty\ (l[-e]*j[e^]r"[i^]*t[y^]), n. [F.
   l['e]g[`e]ret['e]. See 3d {Leger}.]
   Lightness; nimbleness. [Archaic] --Shak.

Source : WordNet®

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