Roget's 21st Century Thesaurus, Third Edition - 21st Century Reference

Combining scholarly authority with an awareness of today's communication demands, Roget's 21st Century Thesaurus is the simple, reliable way to find the perfect word for your needs. It features an easy-to-use dictionary format plus a revolutionary Concept Index that arranges words by idea, thus enhancing the user's process of association and leading to scores of additional selections. The inclusion of a wide spectrum of words and phrases with each entry(from sophisticated choices to completely new vocabulary in the language(brings users an exceptional number of alternatives to fit any variation of style and tone.

Created by the highly respected Princeton Language Institute
More word choices than any other thesaurus (OVER 1 MILLION WORDS!)
Concise definitions for each main entry
A revolutionary Concept Index (arranged by idea, it mirrors the way we actually think!)
No obsolete terms (all synonyms and antonyms reflect modern usage)