The Oxford English Dictionary serves as the authoritative source on the development of the English language, offering the most comprehensive collection available of definitions, word origins, and histories of the usage of words over time. The online version includes all 20 volumes of the 1989 2nd Edition of the Dictionary, plus the three supplementary volumes that have been published since that time. In addition, a major revision of the Dictionary, begun in 1993, is ongoing, with approximately 1,800 new and revised words added quarterly to the online OED.

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