The Historical Thesaurus of the Oxford English Dictionary is the first historical thesaurus to be compiled for any of the world's languages, and includes almost the entire vocabulary of English from Old English to the present day. Conceived and compiled by the English Language Department of the University of Glasgow, the Historical Thesaurus of the Oxford English Dictionary is a groundbreaking analysis of the historical inventory of English. The thesaurus organization follows a thematic system of classification, with entries arranged in a semantic hierarchy according to their meanings rather than listed alphabetically. This means that, for example, all the verbs meaning 'to eat', and other words connected with eating, can be viewed together. The Historical Thesaurus also has a unique historical component, and is linked directly to the senses and the dating of words in the OED. For each individual entry synonyms are presented in chronological order according to the first recorded date of the word's use in English, with earliest synonyms first. The Historical Thesaurus thereby lists obsolete words, and obsolete meanings of current words as well as offering a comprehensive treatment of current English. The Historical Thesaurus of the Oxford English Dictionary is a unique resource for scholars of all types - linguists and language specialists, historians, literary commentators, etc. - as well as being a fascinating resource for everyone with an interest in the English language and its historical development. It is a perfect complement to the OED itself, allowing the words in the OED to be cross-referenced and viewed in wholly new ways. The text is made up of two main parts: the main text, comprising numbered sections for semantic categories, and the index, comprising a full A-Z look up of nearly one million lexical items. There is also an introductory essay and a full list of the semantic hierarchy. The Historical Thesaurus includes almost every word in English from Old English to the present day, drawing on the Oxford English Dictionary, and supplemented by the following specialist dictionaries of Old English: Jane Roberts and Christian Kay with Lynne Grundy, A Thesaurus of Old English, King's College London Medieval Studies XI, 1995, 2 vols., xxxv + 1555. Second edition, Amsterdam: Rodopi, 2000. Online version 2005 Bosworth, Joseph, 1868. A Compendious Anglo-Saxon and English Dictionary. London: J. R. Smith. Bosworth, Joseph and T. Northcote Toller, eds. 1898. An Anglo-Saxon Dictionary. London: Oxford University Press; T. Northcote Toller, ed. 1921. An Anglo- Saxon Dictionary: Supplement. London: Oxford University Press; Alistair Campbell, ed. 1972. An Anglo-Saxon Dictionary: Enlarged Addenda and Corrigenda. Oxford: Clarendon Press. Clark Hall, John R. 1960. A Concise Anglo-Saxon Dictionary, 4th edn with a supplement by Herbert D. Meritt. Cambridge: Cambridge University Press. Dictionary of Old English. Antonette DiPaolo Healey and Richard L. Venezky, ed. A Microfiche Concordance to Old English. Toronto, 1980; Richard L. Venezky and Sharon Butler, ed. A Microfiche Concordance to Old English: The High Frequency Words. Toronto, 1985. The five letters then edited by the Dictionary of Old English team were also consulted: Fasc. D, 1986; Fasc C, 1988; Fasc. B, 1991; Fasc. AE, 1992; Fasc. Beon, 1992; Fasc. A, 1994.