Webster's English Dictionary

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lowercase

1. low.er.case \.lo-(-*)r-'ka-s\ aj [fr. the compositor's practice of 
   keeping such types in the lower of a pair of]type cases of a letter  : 
   having as its typical form a f g or b n i rather than A F G or XB N I - 
   lowercase n
2. lowercase vt : to print or set in lowercase letters