Free short-entry visual encyclopedia with a searchable collection of more than 25,000 entries. Special focus on history, the arts, geography, and science and technology. For everyone.

Free access to reference works such as The Columbia Encyclopedia, Oxford's World Encyclopedia, and the Encyclopedia of World Biography and many others. Contains free citations and excerpts to periodical articles. You have to pay money to read full text of articles.

Encyclopedias and specialized reference sources for multidisciplinary research. All articles full text. For the general user.

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Type in a word to find definitions, synonyms, and antonyms. For everyone.