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Usability is degree to which a product or system can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use. This characteristic is composed of the following sub-characteristics:

• Appropriateness recognizability - Degree to which users can recognize whether a product or system is appropriate for their needs.
• Learnability - Degree to which a product or system can be used by specified users to achieve specified goals of learning to use the product or system with effectiveness, efficiency, freedom from risk and satisfaction in a specified context of use.
• Operability - Degree to which a product or system has attributes that make it easy to operate and control. User error protection. Degree to which a system protects users against making errors.
• User interface aesthetics - Degree to which a user interface enables pleasing and satisfying interaction for the user.
• Accessibility - Degree to which a product or system can be used by people with the widest range of characteristics and capabilities to achieve a specified goal in a specified context of use.

Source: https://iso25000.com/index.php/en/iso-25000-standards/iso-25010/61-usability