See also #usable.
The term previously used (esp. within the ISO-25010) was usability.
Definitions:
capability of a product to be interacted with by specified users to exchange information between a user and a system via the user interface to complete the intended task
Note 1: Interaction capability in the product quality model and its subcharacteristics focus on a set of attributes that enable interaction by users (or operators) to complete specific tasks in a variety of contexts of use. On the other hand, usability as defined in the quality-in-use model (ISO/IEC 25019) comprehensively focuses on outcomes of use to determine whether tasks are achieved by users with effectiveness, efficiency and satisfaction in a specific context of use.
Note 2 to entry: Interaction capability is a prerequisite for usability..