Includes 100,000 definitions and 28,000 usage examples with 150 newly added words across a variety of fields, including technology, entertainment, health, science and society. Features 500 synonym paragraphs, 200 word history paragraphs that clarify meaning. 1,280 pages. The authoritative high school dictionary written for students grade 9-11, ages 14 and up. Perfect for school, self study, or simply browsing!