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Wiktionary
uppercase

a. written in upper case; capital n. (alternative spelling of upper case English)

WordNet
uppercase

adj. relating to capital letters which were kept in the top half of a compositor's type case; "uppercase letters; X and Y and Z etc" [ant: lowercase]

Usage examples of "uppercase".

Looming fifty-five feet tall, the antiballistic missile was painted white with accurate black tail and fin markings and a vertical stack of uppercase letters spelling US ARMY.

Parker said, squinting as he checked out an uppercase K, which can be' written a number of different ways and therefore is very useful in handwriting analysis.