Definitions for "Learnability"
The ease with which novice users can understand how to use the system initially and achieve a maximal level of performance .
how easy is it for the user to learn how to complete the processes needed within the system. Learnability can be tested by exposing the user to a system and then bringing them back later to see if they still understand how to complete a task. Learn more from Usability 101.
A measure of the degree to which a user interface can be learned; an attribute of a usable system. The ease of learning the functionality of a system and gaining proficiency to complete basic and necessary tasks. Factors affecting this measure include the amount of time, training, and support required for the user to learn the system. SEE READABILILTY AND USABILITY