Definition of function key noun from the Oxford Advanced Learner's Dictionary

 

function key

 noun
noun
BrE
 
; NAmE
 
(computing) Using a computer
 
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one of several keys on a computer keyboard, each marked with ‘F’ and a number, that can be used to do something, such as save a file or get to the ‘help’ function in a program See related entries: Using a computer
See the Oxford Advanced American Dictionary entry: function key