usability
n.how easy and pleasant a tool or website is to use. If something has good usability, you can understand how it works without getting frustrated.
n.the degree to which a product, system, or interface can be used by specified consumers to achieve quantified objectives with effectiveness, efficiency, and satisfaction.
“The new app design focuses on better usability.”
“The development team conducted several rounds of testing to identify usability issues that were confusing new customers during the checkout process.”
“While the software offers a comprehensive suite of advanced features, its poor usability often discourages novice users from exploring beyond the most basic functions.”
Often paired with 'testing' or 'design' to describe the process of making products more user-friendly.
“Google won by combining technical rank, usability, and scale at exactly the moment the rest of the Internet was ready to abandon the old order.”
From usable + -ity or use + -ability.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.