Source : Webster's Revised Unabridged Dictionary (1913)

Legibility \Leg`i*bil"i*ty\ (l[e^]j`[i^]*b[i^]l"[i^]*t[y^]), n.
   The quality of being legible; legibleness. --Sir. D.
   Brewster.

Source : WordNet®

legibility
     n 1: distinctness that makes perception easy [syn: {discernability}]
     2: writing (print or handwriting) that can be easily read [syn:
         {readability}] [ant: {illegibility}]