(kap) noun
1. A covering to be worn on the head; specifically, a brimless head covering, often with a shade or vizor in front.
2. A head covering for a woman or an infant made of lace or some soft fabric.
3. Any headgear of unique design to distinguish some order, office, dignity, or characteristic of the wearer.
4. Anything resembling or used as a cap: a bottle cap.
5. The primer of a cartridge or shell case.
6. Bot. The pileus of a mushroom.
7. The top of an oil well.
8. Any of various large sizes of writing paper. See FOOLSCAP, LEGAL CAP.
9. Archit. The upper member of a column or pilaster; a capital.
—test cap A protective covering for the exposed end of a cable, excluding dirt, moisture, etc.
—to set one's cap for To try to win as a suitor or husband.
—v.t. capped, cap·ping
1. To put a cap on, as the head.
2. To fit the top or summit of with a cover: Bees cap their cells.
3. To serve as a cap to; lie on top of; crown: The cloud capped the mountain.
4. To add the final touch to; complete.
5. To excel; top.
—to cap the climax To surpass the climax; exceed the limit. [OE cæppe <LL cappa hooded cloak, cap, prob. <caput head]

(kap) noun Colloq.
A capital letter.