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The OED traces the usage of words through 2.5 million quotations from a wide range of international English language sources, from classic literature and specialist periodicals to film scripts and cookery books. The OED covers words from across the English-speaking world, from North America to South Africa, from Australia and New Zealand to the Caribbean.

The Oxford English Dictionary is a historical dictionary of English, covering the language from the earliest times to the present day. It aims to show not only the current meanings of words, but also to trace their development through time. Entries contain detailed etymological analysis, and are illustrated by quotations from a wide range of English language sources from around the world, making the OED a unique historical record.