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

 

Alt key

 noun
(also ALT key)noun
BrE BrE//ˈɔːlt kiː//
 
; NAmE NAmE//ˈɔːlt kiː//
 
Using a computer
 
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a key on a computer keyboard which you press while pressing other keys, in order to change their function See related entries: Using a computer Word Origin late 20th cent.: abbreviation of alt(ernative) key.
See the Oxford Advanced American Dictionary entry: Alt key