Etymology
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lowercase (v.)

"to set (text) in lower-case type," 1911, from lower-case (adj.). Related: Lowercased; lowercasing.

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Definitions of lowercase
1
lowercase (n.)
the characters that were once kept in bottom half of a compositor's type case;
Synonyms: small letter / lower-case letter / minuscule
2
lowercase (adj.)
relating to small (not capitalized) letters that were kept in the lower half of a compositor's type case; "lowercase letters; a and b and c etc";
From wordnet.princeton.edu