the quality of written language that makes it easy to read and understand
"The editor praised the article for its high readability, noting how effortlessly the complex data was presented in simple sentences."
a quality of writing (print or handwriting) that can be easily read
"The teacher chose a font size that greatly improved the readability of the handouts for all her students."
The property of being capable of being read; legibility.
"The ink had faded so badly that the old manuscript was barely readable, making its poor readability a major problem for historians trying to decipher it."