This is the world's most comprehensive online dictionary which gathers information from diverse
sources. It has dictionaries in English, Spanish, French, German, Italian, Chinese, Portuguese, Dutch, Norwegian, Greek and Russian language. Also it has professional dictionaries such as medical, legal ad Financial Dictionaries. In addition to various dictionaries, it consists of Thesaurus, Acronyms and Abbreviations, Idioms, Encyclopedia, a Literature Reference Library, and a Search Engine all in one!
From January 2006,
TheFreeDictionary.com released a feature that allows the user to create own personal homepage by adding and removing, dragging and dropping, and "using or losing" existing content windows
Well… I found this website amazing and very useful.