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Definition: a computer input device that is used by moving it around on your desk and pressing one or more buttons. Moving the mouse moves a pointer on the screen (see MOUSE POINTER). Graphical user interfaces such as Microsoft Windows and the Apple Macintosh operating system are built around the mouse. So are paint and draw programs.
Source: Downing, Douglas, et al. Dictionary of Computer and Internet Terms. 10th ed. New York, 2009. Print.