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Longman Dictionary of Contemporary English
lower case
noun
EXAMPLES FROM CORPUS
▪ All its letters are in lower case and the picture cards incorporate both approaches.
▪ Another approach is to use a mixture of numbers, upper and lower case letters and large and small Roman numerals.
▪ 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.
▪ Since variables named in lower case will never be confused with keywords, many programmers use upper case only for keywords.
▪ The magic, upper and lower case, is gone.
▪ The text which appears in them is usually in lower case, but this doesn't matter.
▪ Upper and lower case variables of the same name are different.
The Collaborative International Dictionary
lower case

Case \Case\ (k[=a]s), n. [OF. casse, F. caisse (cf. It. cassa), fr. L. capsa chest, box, case, fr. capere to take, hold. See Capacious, and cf. 4th Chase, Cash, Enchase, 3d Sash.]

  1. A box, sheath, or covering; as, a case for holding goods; a case for spectacles; the case of a watch; the case (capsule) of a cartridge; a case (cover) for a book.

  2. A box and its contents; the quantity contained in a box; as, a case of goods; a case of instruments.

  3. (Print.) A shallow tray divided into compartments or ``boxes'' for holding type.

    Note: Cases for type are usually arranged in sets of two, called respectively the upper and the lower case. The upper case contains capitals, small capitals, accented and marked letters, fractions, and marks of reference: the lower case contains the small letters, figures, marks of punctuation, quadrats, and spaces.

  4. An inclosing frame; a casing; as, a door case; a window case.

  5. (Mining) A small fissure which admits water to the workings.
    --Knight.

Wiktionary
lower case

n. The minuscule or small letters (a, b, c, as opposed to the uppercase or capital letters, A, B, C).

WordNet
lower case

n. the characters that were once kept in bottom half of a compositor's type case [syn: small letter, lower-case letter, minuscule] [ant: capital]

Usage examples of "lower case".

The writing seemed bewilderingly to comprise familiar letters of the alphabet, but mixed capitals and lower case, plus familiar letters of the alphabet printed backward or upside down, plus a sprinkling among them of totally unfamiliar characters.

Although my child should I be given a chance to create him will be the saviour of the world, I do not believe myself to be God or even god in the lower case.