The authoritative middle school dictionary. A revised and updated edition of the best-selling dictionary written especially for students grades 6-8, ages 11-14. Features nearly 70,000 entries with new words and meanings added across a variety of fields including technology, social media, science, health, and popular culture 23,000 usage examples and more than 1,000 carefully drawn illustrations clarify and expand understanding. , , Abundant word history and synonym paragraphs. A great study aid for students building vocabulary and engaging with more complex text as they prepare for high school. New words added include: cloud computing, derecho, selfie, and tweet