With more than 350,000 entries and definitions--including 16,000 new words and meanings; over 500 usage notes from our Usage Panel; 4,000 illustrations; an Appendix of Indo-European Roots; 900 synonym paragraphs; 400 word history notes; and more. The CD-ROM version also includes the complete Roget's II: The New Thesaurus, making this package an exceptional value. System Requirements: CD-ROM drive; Windows: 3.1 or higher, 4 MB RAM, 100K­15MB hard-disk space; DOS: IBM compatible PC with 640K RAM, DOS 3.1 or higher, 180K­15MB hard-disk space. Mac: any Macintosh with System 6.0.2 or higher, 1 MB RAM (2MB System 7), 30K­14MB hard-disk space.