Source : Webster's Revised Unabridged Dictionary (1913)

Limpidity \Lim*pid"i*ty\ (l[i^]m*p[i^]d"[i^]*t[y^]), n. [L.
   limpiditas: cf. F. limpidit['e].]
   The quality or state of being limpid.

Source : WordNet®

limpidity
     n 1: free from obscurity and easy to understand; the
          comprehensibility of clear expression [syn: {clarity}, {lucidity},
           {pellucidity}, {clearness}] [ant: {unclearness}, {obscureness}]
     2: passing light without diffusion or distortion [syn: {pellucidness},
         {pellucidity}]