Webster's Dictionary & Thesaurus - Merriam-webster

Two important reference books are combined in one volume covering the core vocabulary students in grades 3-6 need. This is an ideal tool for homeschooling, classroom use, or general study. Features clear and concise definitions for more than 20,000 words 50,000 synonyms and antonyms help expand a student's vocabulary Created in cooperation with the editors of Merriam-Webster, America's leading provider of language information.