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

 

lower case

 noun
noun
BrE
 
; NAmE
 
[uncountable](specialist)
 
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(in printing and writing) small letters The text is all in lower case. lower-case letters compare capital, upper case Word Originreferring originally to the lower of two cases of type positioned on an angled stand for use by a compositor (see upper case).