Any of a set of keys on a personal computer or terminal keyboard used to activate a predefined or programmable function; often labelled F1 to F12, and used in combination with the shift key, alt key and control key
special key marked with F and a number which is used to perform actions determined by a specific program program (Computers)
Function keys are the keys along the top of a computer keyboard, usually numbered from F1 to F12. Each key is designed to make a particular thing happen when you press it. Just hit the F5 function key to send and receive your e-mails. A key on a computer keyboard that activates a function within a given application when pressed, either alone or in various combinations with the alt key, the shift key, and the control key. a key on a computer keyboard that tells the computer to do something