Dictionaries And Encyclopedias

Britannica Concise A complete, 28,000 article, single-volume encyclopedia from the editors of Encyclopædia Britannica.

Columbia Encyclopedia Containing nearly 51,000 entries, and with more than 80,000 hypertext cross-references, this is the current Sixth Edition.

Dictionary.com A multi-source dictionary search service that includes The American Heritage^® Dictionary of the English Language (Fourth Edition) and the Webster's Revised Unabridged Dictionary.

Encyclopedia.com More than 57,000 frequently updated articles from the Columbia Encyclopedia, Sixth Edition.

Thesaurus.com Uses Roget's New Millennium^™ Thesaurus.

Wikipedia An international Web-based free-content encyclopedia that allows visitors to edit its content. A study published in the journal Nature in 2005 showed that Wikipedia was on par with Encyclopædia Britannica for accuracy in its science articles.