Definition of usability in US English:

usability

(also useability)

noun

  • The degree to which something is able or fit to be used.

    ‘it was important to measure the usability of each product’
    • ‘The thinness of the device is at the expense of usability.’
    • ‘Simplification is one of the best ways to improve usability.’
    • ‘As for usability, it is extremely easy to use, with a lot of energy put into sensible search functions.’
    • ‘What we now have are really snazzy features that vastly improve the useability of the directory.’
    • ‘The key is making a site distinct without interfering with its usability.’

Pronunciation

usability

/ˌyo͞ozəˈbilədē//ˌjuzəˈbɪlədi/