Buy one of Mobipocket's best selling ebook dictionaries. 

The Collins English Dictionary: Complete and Unabridged with over 500,000 words, references and definitions.
More...

The LONGMAN DICTIONARY OF CONTEMPORARY ENGLISH just got even more contemporary. Download the new 5th edition today to find the meaning of hundreds of new words – now with FREE Thesaurus and Collocations
More...

Save 40% on the combination of these two dictionaries:
Electronic Pocket Oxford English Dictionary
Oxford Paperback Thesaurus

When you purchase this special Value Pack, both files are added to your Mobipocket account.

You can set this dictionary as your default Kindle dictionary and look up words while reading. The default setting is The New Oxford American Dictionary included on your Kindle, but you have the option to change your default setting to this compatible
More...

This is the world's bestselling advanced learner's dictionary, trusted and recommended by learners of English and their teachers, and used by over 30 million people.

The e-book edition is more up to
More...

The Collins Essential English Dictionary for Mobipocket gives you access to a truly unique English language resource with over 190,000 words, references and definitions.

All the clear, concise, and accurate dictionary
More...

One of europe's best selling French Dictionaries - The Collins French Dictionary. Over 300,000 words, phrases and translations.

• The comprehensive French dictionary for study and reference
• Have confidence
  More...

You can set this dictionary as your default Kindle dictionary and look up words while reading. The default setting is The New Oxford American Dictionary included on your Kindle, but you have the option to change your default setting to this compatible
More...

Europe's best selling Spanish Dictionary - The Collins Spanish Dictionary.

This Mobipocket version gives you access to a truly unique English / Spanish language resource with 250,000 words, phrases and translations.

More...

Over 90,000 words and phrases, 115,000 translations
Derived from the universally acclaimed Oxford-Duden German Dictionary, this dictionary is designed specifically to meet the needs of students in their first years of studying German, whether at school
More...