Combining scholarly authority with a new 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 as 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 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 the user an exceptional number of alternatives to fit any variation of style and tone. Created by a leading expert in linguists and lexicography with today's communication needs in mind. 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 reflect modern usage.