My Online Dictionary

What is a good free ware dictionary for windows?

I want it to be something like the dictionary application of a Mac. note: i do not want an extension. i want a stand-alone application

Public Comments

1. http://dictionary.reference.com/
2. http://www.iespell.com/download.php
3. I don't have a Mac, but I always use www.dictionary.com. There is a thesaurus there too.