…the overall experience of a person using a product such as a website or computer application, especially in terms of how easy or pleasing it is to use…
…the means by which the user and a computer system interact, in particular the use of input devices and software…
…a person who uses a wheelchair, especially because of physical disability…
…a visual way of interacting with a computer using items such as windows, icons, and menus, used by most modern operating systems…
…a user of a computer system with special privileges needed to administer and maintain the system; a system administrator…
