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The best American English learner's dictionary is better than ever, with new words and new features. Based on the world's largest corpus of American English, the book and CD include up-to-date vocabulary, easy-to-understand definitions, helpful usage notes, and examples that show how English is really used. The CD-ROM features spoken pronunciations for every word, advanced search features, a thesaurus, and instant lookups of words on Web pages and other documents.