Mac Millan Dictionary

http://www.macmillandictionary.com/

Main features:

• word look up
• online pronunciation:
  Audio recordings of all headwords are available in both British and American accents
• pronunciation symbols
• words put into context
• thesaurus to discover more usages
• rating systems to highlight commonly used words 

The free online thesaurus from Macmillan thesaurus is fully integrated into the dictionary entries, giving you a targeted list of synonyms and words related exactly to the meaning you are looking for.


 

 Although the English language has up to a million words, native speakers use just 7,500 words for 90% of what they speak or write. These words represent the core vocabulary of English, and they are words that everyone needs to be able to use with confidence. They appear in red in Macmillan Dictionary, along with a star rating. Three-star words are the most common 2,500 words in the language. Two-star words are the next most common, and one-star words are the next most common 2,500.