Family-friendly volume features more than 200,000 clear, concise definitions with over over 5,000 new words and tenses from all areas of vocabulary, with special emphasis on high technology, science, medicine and social change. Biographical and geographical entries have been completely updated, reflecting current events and the latest census. Includes over 400 updated line drawings. Includes detailed illustrations, synonym list, revised style guide and redesigned tables for world alphabets, the Bible, calendar, currency, elements, geologic time and measurement. Thumb indexed.