definition of a computer keyboard and mouse
Definition of keyboard for English Language Learners. : 1  a row or set of keys that are pushed to play a musical instrument (such as a piano) : 2  a musical instrument that is played by means of a keyboard like that of a piano and that produces sounds electronically. : 3  the set of keys that are used for a computer or typewriter.
Definition of mouse for English Language Learners. : 1  a very small animal that has a pointed nose and a long, thin tail. : 2  a small device that is connected to a computer and that you move with your hand to control the movement of a pointer on the computer screen.