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

 

soft key

 noun
noun
BrE BrE//ˈsɒft kiː//
 
; NAmE NAmE//ˈsɔːft kiː//
 
 
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a button on a a computer keyboard or mobile device which can be set to perform different functions The soft keys have different functions, depending on the phone. You can customize the functions of soft keys B and C.