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This is the largest and most comprehensive dictionary of the English language as it is currently used today. The famous "unabridged" is the latest in the long history of dictionaries directly descended from Noah Webster's original English-language dictionary of 1828.
The Oxford English Dictionary is a historical dictionary of English, covering the language from the earliest times to the present day. Entries contain detailed etymological analysis and are illustrated by quotations from a wide range of English language sources from around the world. It is most useful to track how a word's meaning has developed and changed during the time it has been part of the English language.
Dictionaries of Literary Terms
The following reference works are good sources for findingdefinitions of the terms used by scholars when analyzing literature.