The Best Classroom Resource Updated! This best-selling edition has been fully revised and expanded. The concise, clearly written definitions offered in the dictionary reflect the curricula for grades 3 through 6. The thesaurus provides synonyms, antonyms and related words that enrich vocabulary. The world atlas, created by the editors of Encyclopædia Britannica, is an invaluable aid to students in their studies of world events. Features of this Book 37,000 kid-friendly definitions in the dictionary Fully updated, the 48 page, full-color atlas covers all the countries of the world 122,000 synonyms, antonyms and related words, are alphabetically listed in the thesaurus