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OneLook Dictionariesis the best place to look up a word or term in an Internet dictionary or glossary. Free search access to a frequently updated database of words, terms, names, acronyms vs Internet links to on-line dictionaries or glossaries.
Dictionary.comis a free online dictionary, thesaurus, translator, word of the day, crossword puzzles and word games, and vocabulary learning resources for many languages.
Bartleby.comis an online publication of The American Heritage Dictionary, Fourth Edition. Featuring 70,000 audio word pronunciations, 900 full-page illustrations and over 10,000 new words and senses.