Based on the authoritative American Heritage(R) Dictionary of the English Language, Fifth Edition, the Office Edition has been completely updated; every single

The American Heritage Dictionary Define-a-Thon for the High School Graduate offers an entertaining way to help high school students and graduates become vocabul

This new edition offers newly updated terms, and provides the latest research on word origins and meanings, with guidelines on accurate usage.

Contains entries for over 10,000 new words reflecting the explosion of computer and Internet technology as well as changes in popular culture and slang.

Senior moment. Think outside the box. Idioms like these can't be understood just from the words that make them up. The American Heritage® Dictionary of Idioms