"lowercase" in the noun sense
1. small letter, lowercase, lower-case letter, minuscule
the characters that were once kept in bottom half of a compositor's type case
"lowercase" in the adjective sense
1. lowercase
relating to small (not capitalized) letters that were kept in the lower half of a compositor's type case a and b and c etc"
"lowercase letters
Source: WordNet® (An amazing lexical database of English)
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