The authoritative middle school dictionary.a revised and updated edition of the best-selling dictionary written especially for students grades 5-8, ages 10-14. 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- autocorrect, dystopia, biomass, and Internet of Things.