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

Mathwarehouse.com--a website dedicated to Math lessons, demonstrations, interactive activities and online quizzes on all areas of geometry, algebra an...

Dictionary.com - the largest and most trusted free online dictionary. Instantly look up accurate and extensive definitions and word meanings, and hear...

Definition of word from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.

A nonpartisan resource for information and analysis

Purplemath contains practical algebra lessons demonstrating useful techniques and pointing out common errors. Lessons are written with the struggling ...

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

Yale University comprises three major academic components: Yale College (the undergraduate program), the Graduate School of Arts and Sciences, and the...

Open Biological and Biomedical Ontologies, a collection of freely available well-structured controlled vocabularies.