Dictionary.com

Name: Dictionary.com
Rating: 4 (1328 reviews)

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Description: The FREE Dictionary.com app delivers trusted reference content from Dictionary.com and Thesaurus.com, including over 2,000,000 words. It also features audio pronunciation and updated daily content. Get the world’s #1 dictionary app on your phone today!

Windows Phone 8 Update:
Fix to download offline dictionary content
Voice search commands
New live tiles

Features:
Dictionary and Thesaurus
Available even without internet connection
Over 2 million words, definitions, synonyms and antonyms
Audio pronunciations
Voice search
Word origins and example sentences
Favorite words list
Daily content: Word of the Day, Hot Word Blog, Question of the Day, and Spanish Word of the Day; MoreLess