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The Physics Classroom is an online interactive tutorial of basic physics concepts. The lessons use an easy-to-understand language to present common physics principles discussed in a first-year high school physics course.

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

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

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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 dictionary search as a crossword or scrabble dictionary. Also find legal dictionary, technical words, glossar...

Educational and entertaining items pertaining to physics, the mathematical sciences, and to mathematics in general.

The Free Online English Dictionary from Macmillan Publishers.

Vocabulary.com helps you learn new words, play games that improve your vocabulary, and explore language.

Computer Glossary, Computer Terms – Technology Definitions and Cheat Sheets from Whatis.com – The Tech Dictionary and IT Encyclopedia

This GuideSite focuses on the science of physics, addressing the major theories of physics, laws of physics, physical equations, the scientific method, history of physics, and physics experiments, as well as advice in completing physics homework.

Investopedia.com - Your Source For Investing Education. Includes the most comprehensive investing dictionary on the web as well as articles and tutorials on nearly any aspect of the market.

Free online English dictionary from Oxford, plus thesaurus, word of the day, resume examples, letter writing, and English grammar