2chiefly British a small disc or cylinder of a compressed solid substance, typically a measured amount of a medicine or drug:headache tabletsecstasy tablets
British a small block or bar of soap.
3North American a writing pad.
(also tablet computer or tablet PC) ( trademark in the UK) a small portable computer that accepts input directly on to its screen rather than via a keyboard or mouse.
4a kind of token giving authority for a train to proceed over a single-track line.
5 [mass noun]Scottish a traditional sweet made from sugar, condensed milk, and butter.