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Oed.com - the most comprehensive English dictionary, but it's not free unless logged on through the school's portal. 

Dictionary.com - a multiple dictionary search service. 

The Philosophical Lexicon - an online dictionary of philosophical terms.

Stanford Encyclopedia of Philosophy

Internet Encyclopedia of Philosophy

The Philosophers Index is a current, comprehensive, and easy-to-use subject and author index to philosophical articles, books, and anthologies.

A Dictionary of Philosophical Terms and Names  - there is also an extensive listing of encyclopedias and dictionaries related to philosophy here.