(computing) A type of user interface which allows people to interact with a computer through a metaphor of direct manipulation of graphical images and widgets in addition to text.

In a useful manner; in a way that achieves something

Alternative spelling of username

The final consumer of a product; the intended recipient or user.

(computing) The visual part of a software application that a user sees and interacts with.

(computing) A person who makes heavy use of computers, running many applications and capable of using advanced functionality.

(computing) The desired, expected, or actual experience of a user interacting with a product, especially as it relates to the design of the product's user interface.

(computing) A program or subroutine, provided by the user rather than being built into the system, that may return a value and may take input parameters.

Alternative spelling of usable

the quality of being useless