The search engine giant silently pushed out Google Dictionary. It has pretty neat usage examples along with standard dictionary-like features such as definitions and synonyms.
Google Dictionary also displays related phrases, related languages and Web definitions from the likes of Wikipedia.
You can also star words for later reference.
It also has Translator options (don't confuse with Google Translate) where you can translate the meaning of English word to your own regional language.
for example - I have translated the English word - " Human " and found out the meaning in my regional lang " Tamil ".
Google Dictionary - Homepage