Usability

n.capable, kindprofessional

What it means

The degree to which intended people can use something effectively and comfortably.

Reach for it when Evaluating how easily users learn, navigate, and complete tasks with a product or service.

Larger controls improved the ticket machine's usability for gloved passengers.

everyday
ease of use
plain language is more important than technical brevity
not when does not include whether goals are completed accurately
everyday
practicality
fitness for real conditions matters
not when does not address interaction clarity
professional
accessibility
barriers for disabled people are the key concern
not when not interchangeable with general ease of use
professional
user experience
the whole interaction and perception are assessed
not when broader than task-level usability
formal
learnability
speed of becoming competent is being measured
not when only one component of usability
formal
operability
a system can be controlled as intended
not when technical and narrower than comfort or learning

improve usability
Numbered steps improve usability during stressful evacuations.
usability testing
Usability testing revealed that the confirmation button was easy to miss.
overall usability
Clearer error messages raised the form's overall usability.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.