Oxford English Dictionary: 20 vol. print set & CD ROM [Hardcover]
J. Simpson (Author), E. Weiner (Author)
The 20-volume Oxford English Dictionary is the accepted authority on the evolution of the English language over the last millennium. It traces the usage of words through 2.4 million quotations from a wide range of international English language sources.
The OED has a unique historical focus. Accompanying each definition is a chronologically arranged group of quotations that trace the usage of words, and show the contexts in which they can be used.