'Readability' definitions:

Definition of 'readability'

From: WordNet
noun
The quality of written language that makes it easy to read and understand
noun
A quality of writing (print or handwriting) that can be easily read [syn: legibility, readability] [ant: illegibility]

Definition of 'Readability'

From: GCIDE
  • Readability \Read`a*bil"i*ty\ (r[=e]d`[.a]*b[i^]l"[i^]*t[y^]), n. The state of being readable; readableness. [1913 Webster]