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.