English Dictionary Online
VDict (Vietnamese Dictionary) is the best and totally free Vietnamese-English-French Online Dictionary
Merriam-Webster
Dictionary
You can hear the pronunciation of words.
Visual Dictionary. To learn by way of image with thematic, clear and precise pages, with concise and rigorous texts.
Cambridge
Advanced Learner's Dictionary
You can add it to your browser.
Newbury House dictionary of American English contains over 40,000 entries. With simple, clear definitions, and provides a wealth of sample sentences and idioms.
Encyclopedia
Britannica
Lets users simultaneously search the encyclopedia, expert reviews of
the Web's best sites, timely articles from leading magazines, and
related books.
Encarta World English Dictionary A big talking dictionary, click to hear the pronunciation of the word.
Wikipedia!
A free, open-content encyclopedia in many languages.
Your
dictionary.com
More than 1500 dictionaries representing more than 230 languages.
Answer.com
A great site with all definition of every concept and term
Babel
Fish
Machine translations of texts.
Eurodicautom
The European Commission's multilingual term bank. The focus is on
specialized and technical terminology.