Premium reference set includes Merriam-Webster's Collegiate Dictionary, Eleventh Edition, Merriam-Webster's Collegiate Thesaurus, Second Edition, and Merriam-Webster's Collegiate Dictionary & Thesaurus, Electronic Edition (Win/Mac CD-ROM). Both books feature leather-look hardcovers and come in a matching slipcase. Dictionary includes 225,000 definitions, including more than 10,000 new words. The thesaurus includes 305,000 synonyms, antonyms, related and contrasted words, and idioms. Brief definitions describe the meaning shared by synonyms. The set also includes a free one-year subscription to Merriam-Webster's collegiate website.