Oxford English dictionary online The online version of the Oxford English Dictionary provides access to the material contained in the 2volume Second Edition of the Oxford English Dictionary and the 3 volumes of Additions. Includes: Aspects of English informative commentaries on the English language, written by dictionary editors and specialist authors ; and Historical Thesaurus of the OED: now fully incorporated into OED Online, the Historical Thesaurus of the OED arranges the dictionary by meaning. enabing users to trace the changing language of the material world, the mind, and society, from the Anglo-Saxon period to the modern day.