Definition of upper case noun from the Oxford Advanced Learner's Dictionary

 

upper case

 noun
noun
BrE
 
; NAmE
 
[uncountable](specialist)
 
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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 upper case. upper-case letters compare lower case Word Originreferring originally to two printer's type cases positioned on an angled stand, the case containing the capital letters being higher and further away from the compositor.