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The OED is updated on a quarterly basis, and the updates make up the Third Edition of the OED. The material added to the dictionary includes revised versions of existing entries (which replace the older versions), and new words and senses both within the alphabetical sequence of revised entries and also across the whole A to Z range.
Widely regarded as the accepted authority on the English language, the OED is a guide to the meaning, history, and pronunciation of 600,000 words— past and present—from across the English-speaking world. It includes present-day meanings, along with the history of individual words, and of the language—traced through 3 million quotations, from classic literature and specialist periodicals to film scripts and cookery books.