When It Comes To Mobile, How Would You Define Usability?

•   The visitor's time navigating your site
•   The visitor's experience on your site
•   The visitor's general time on your site
•   The visitor's purpose when on your site

Usability is the ease of use and learnability of a human-made object such as a tool or device. In software engineering, usability is the degree to which a software can be used by specified consumers to achieve quantified objectives with effectiveness, efficiency, and satisfaction in a quantified context of use.