The Free Dictionary

The World’s most comprehensive free online dictionary, thesaurus, and encyclopedia with synonyms, definitions, idioms, abbreviations, and medical, financial, legal specialized dictionaries

16 Alternatives To The Free Dictionary

Apple Dictionary

Your Mac also comes with a versatile Dictionary application.
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Blueseal Dictionary

Comprehensive dictionary of English, German, Spanish and French including synonyms.
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Collins English Dictionary

The official Collins English Dictionary online.
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Merriam-Webster

No other dictionary matches M-W’s accuracy and scholarship in defining word meanings. Our pronunciation help, synonyms, usage and grammar tips set the standard.
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Oxford Dictionaries

Free online dictionary of British English and American English from Oxford.

SayWhat

A fun and informative Video Urban Dictionary.

The Online Slang Dictionary

Learn thousands of real slang words or add your own.
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Urban Dictionary

Urban Dictionary is a Web-based dictionary of slang words and phrases.