tablet (Noun) — A slab of stone or wood suitable for bearing an inscription.
tablet (Noun) — A number of sheets of paper fastened together along one edge.
tablet (Noun) — A small flat compressed cake of some substance. ex. "a tablet of soap"
tablet (Noun) — A dose of medicine in the form of a small pellet.
tablet (Noun) — (computing) a portable computer with a flat touch screen rather than a separate keyboard and/or mouse. ex. "The iPad is a tablet computer designed and marketed by Apple"
tablet (Noun) — (computing) an input device that allows one to hand-draw images and graphics, typically by moving a pen over a special pad.