The American Heritage Dictionary of the English Language (AHD) is an American dictionary of the English language published by Boston publisher Houghton Mifflin, the first edition of which appeared in 1969. Its creation was spurred by the controversy over the Webster's Third New International Dictionary. The AHD broke ground among dictionaries by using corpus linguistics in compiling word-frequency and other information. The AHD made the innovative step of combining prescriptive elements (how language should be used) and descriptive information (how it actually is used); the latter was derived from text corpora. Citations were based on a million-word, three-line citation database prepared by Brown University linguist Henry Kucera. (Wikipedia)
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