n.1. A slab or plaque, as of stone or ivory, with a surface that is intended for or bears an inscription.
2. a. A thin sheet or leaf, used as a writing surface.
b. A set of such leaves fastened together, as in a book.
c. A pad of writing paper glued together along one edge.
d. A lightweight, portable computer having a touchscreen as the method by which data is input.
3. A small flat pellet of medication to be taken orally.
4. A small flat cake of a prepared substance, such as soap.