From Longman Dictionary of Contemporary Englishlower caseˌlower ˈcase noun [uncountable] SLATCNletters in their small forms, such as a, b, c etc OPP upper case → capital —lower case adjective lower case letters
Examples from the Corpus
lower case• The magic, upper and lower case, is gone.• Another approach is to use a mixture of numbers, upper and lower case letters and large and small Roman numerals.• Upper and lower case variables of the same name are different.• All its letters are in lower case and the picture cards incorporate both approaches.• Since variables named in lower case will never be confused with keywords, many programmers use upper case only for keywords.• The text which appears in them is usually in lower case, but this doesn't matter.• In some systems the input script is restricted to upper case unconnected letters, or lower case unconnected characters.• Input was lower case handwritten print via a graphics tablet. 