from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Collective term for the capital letters A, B, C, ... as opposed to the small letters a, b, c, ....
from the GNU version of the Collaborative International Dictionary of English
- the top one of a pair of compositor's cases. See the Note under 1st Case, n., 3.
Named for the original arrangement in typesetting, where the drawer or case containing capital letters would traditionally be located above the one containing small letters. (Wiktionary)