Free multilingual dictionary and word-related apps
TheFreeDictionary.com is a great free dictionary available in over a dozen languages.
Includes medical, financial + legal dictionaries
The English dictionaries are exceptionally broad-reaching and include medical, financial and legal dictionaries.
Cool extra features
Also of use to the language learner are their website features, including drag-and-drop rearranging of the interface and double-clicking of any word on the site to see its definition. Word of the day, news, quotations, horoscopes, daily articles and history tidbits provide a flow of updated content to work with.
Word games + personal vocabulary list
Also available are word games and the ability to track a personal vocabulary list.
A variety of language-related mobile apps
If you are language mobile, they maintain numerous dictionary and word-related apps.
Over a dozen languages supported
Arabic, Chinese, Dutch, French, German, Greek, Hebrew, Italian, Norwegian, Polish, Portuguese, Russian, Spanish and Turkish are all supported.
Additional features: Thesaurus, Idioms + Encyclopedia
Also included in this free resource are: Thesaurus, Acronyms and Abbreviations, Idioms, Encyclopedia, a Literature Reference Library and a Search Engine.
All in one - free!