"The American Heritage College Dictionary, Fourth Edition is the one reference book that every reader, writer, and student should own. Every aspect of this dictionary has been updated and revised. It includes: an accessible and readable defining style, helpful usage guidance, and an attractive page design with more than 2,500 photographs and drawings that enhance the definitions and invite browsing. Complete with many new computer and Internet terms along with newly coined words in science, politics, business, and the arts. It has thousands of updated definitions, especially in fast-moving areas like astronomy and immunology. Other timely changes include the addition of biographical entries for newly prominent people and the updating of U.S. towns, cities, and states with population statistics from the 2000 census. "