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YourDictionary is a free online dictionary that offers definition search from Webster's dictionary for word meanings and thesaurus. Use this dictionar...

Free Online English Dictionary & Thesaurus, translation from English to Spanish & Turkish and Spanish to English and other language re...

Comprehensive encyclopedia of mathematics with 13,000 detailed entries. Continually updated, extensively illustrated, and with interactive examples.

Access to hundreds of pages of award-winning information on prime numbers--with links to thousands of pages elsewhere. We host the searchable datab...

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Oxford Advanced Learner

Longman English Dictionary is the leading dictionary for learners of English of all ages and levels who want to learn more about English: definition, ...