Dictionary.com

Free online dictionary search, translator, word of the day, crossword puzzles and word games, and vocabulary learning resources for many languages.

Merriam-Webster Online

Merriam-Webster provides a free online dictionary, thesaurus, audio pronunciations, Word of the Day, word games, and other English language resources.

Online Dictionary, Encyclopedia and Thesaurus. Free access.

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary

Online Dictionary, Thesaurus and Language Reference
yourDictionary - comprehensive authoritative dictionary, thesaurus, glossary and foreign language portal. Every resource needed for language study in more

OneLook Dictionary Search

Type in a word and search many dictionaries at once. Also has a reverse dictionary and translations.

Cambridge Dictionaries Online - Cambridge University

Free online dictionary from Cambridge University Press.