With the Concise Oxford English Dictionary and Thesaurus on Babylon you gain simple and intuitive access to over 240,000 definitions and 365,000 synonyms and antonyms.
Langenscheidt e-Dictionary provides a very good source of information both for professionals and new learners. The dictionary covers over 245,000 translations for each language.
The program is designed to teach English language for beginners as well as for those who want to perfect their spelling, pronunciation and comprehension skills.