Reference: Reference - Dictionaries

Full of synonyms, alternatives, and a fascinating network of cross-references, reflecting both technical and day-to-day aspects of Modern English. It is designed to appeal to both established word-reference enthusiasts and younger users who are just beginning to explore the language.

Roget's II: The New Thesaurus is the essential writing tool for every classroom, home, and office, providing all the features that have made Roget's a trusted name for 100 years.

from the people who provide Ask.com services - most Thesaurus services are free

Includes English & foreign language dictionaries, subject specific dictionaries for: art, business, food & beverage, geography, history, language, law, literature, medicine, music, philosophy, psychology, religion, science, social science, and technology.

terms & acronyms

resource intended for translators, linguists, language students and all those interested in foreign languages

accepted authority on the evolution of the English language over the last millennium.

Michael Quinion's online compendium of articles on new words, word histories, words in the news, and curiosities of native English speech. The site is aimed at language enthusiasts.