1. Also read·a·ble·ness. the state or quality of being readable.
  2. Typography. the property of type that affects the ease with which printed matter can be read for a sustained period.Compare legibility(def 2).

Origin of readability

First recorded in 1835–45; readable + -ity Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for readability

Historical Examples of readability

Word Origin and History for readability

1829, from readable + -ity.

Online Etymology Dictionary, © 2010 Douglas Harper