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Oxford English Dictionary (OED)This link opens in a new windowHistorical dictionary of the English language including the development of words from the earliest times to the present including authoritative definitions, detailed information on pronunciation, variant spellings throughout each word's history, extensive treatment of etymology, and details of area of usage and of any regional characteristics (including geographical origins).
Accompanying each definition is a chronologically arranged group of quotations that illustrate the evolution of meaning from the word's first recorded usage and show the contexts in which it can be used.