Definition of uppercase noun from the Oxford Advanced American Dictionary

 

uppercase

 noun
(also upper case)noun
NAmE//ˌʌpərˈkeɪs//
 
[uncountable]
 
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capital letters (= the large form of letters, for example A, B, C rather than a, b, c) Headings should be in uppercase. compare lowercase
uppercaseadjective
 
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uppercase letters