1) Discernability 2) Distinctness 3) Sharpness 1) Discernability 2) Intelligibility 
Legibility is the degree to which glyphs (individual characters) in text are understandable or recognizable based on appearance. `The legibility of a typeface is related to the characteristics inherent in its design ... which relate to the ability to distinguish one letter from the other.` Legibility includes factors such as `x-height, characte......
• (n.) The quality of being legible; legibleness.
Cumulative effect of printed matter on the human eye.
Leg`i·bil'i·ty (lĕj`ĭ*bĭl'ĭ*tȳ) noun The quality of being legible; legibleness. Sir. D. Brewster. 
[n] - writing (print or handwriting) that can be easily read
legibility 1. Writing (print or handwriting) that can be easily read. 2. Distinctness that makes perception of what is written easy to read.
noun writing (print or handwriting) that can be easily read