The quality/ability/extent of being usable.
Usability is a system quality attribute, which means that it is a characteristic or property of a system that determines its ability to meet user needs and expectations. Usability refers to how easy and intuitive it is for users to interact with a system and accomplish their tasks, without experiencing frustration or confusion.
Usability is also considered a non-functional requirement, which are requirements that specify how the system should behave, rather than what functions it should perform. Non-functional requirements are important because they influence the overall performance, reliability, and maintainability of the system.
Moreover, usability is a cross-functional constraint, which means that it affects multiple aspects of the system, including the user interface design, system architecture, development methodology, and testing procedures. Usability is a constraint because it sets limits on how the system can be designed and developed to ensure that it meets the needs and expectations of its users.
Define usable: Usable refers to the ease with which a computer or software can be utilized by a user to achieve a desired task. It includes the efficiency, effectiveness, learnability, and overall user satisfaction with the technology. A usable technology is intuitive, well-organized, and requires minimal effort to operate.
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Dictionary: usable: available or convenient for use; capable of being used.