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Longman Dictionary of Contemporary English
upper case
noun
EXAMPLES FROM CORPUS
▪ BWright had created 19 letters, all upper case, to use in the project drawings.
▪ In some systems the input script is restricted to upper case unconnected letters, or lower case unconnected characters.
▪ Keywords are not included in square brackets and must be upper case.
▪ Memory jogger Caps Lock will only type letters in upper case.
▪ Should I scrap upper case and dash ahead with lower-case panache to show myself a proper mistress of the form?
▪ Since variables named in lower case will never be confused with keywords, many programmers use upper case only for keywords.
The Collaborative International Dictionary
upper 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
upper case

n. Collective term for the capital letters A, B, C, ... as opposed to the small letters a, b, c, ....

WordNet
upper case

n. one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis; "printers once kept the type for capitals and for small letters in separate cases; capitals were kept in the upper half of the type case and so became known as upper-case letters" [syn: capital, capital letter, upper-case letter, majuscule] [ant: small letter]

Usage examples of "upper case".

The most advanced tribe of them developed not two but three alphabets, almost but not quite identicalcalled upper case, lower case, and scriptfor absolutely no reason at all.