Have you ever needed a dictionary when you were working on the computer without a dictionary handy? Try one of these online dictionaries and you will get much more than if you were to pull a dictionary off the shelf.
My favorite site is the WordNet Vocabulary Helper because it has definitions, synonyms, hypernyms and no ads or other things to distract.
The Merriam Webster Dictionary has a word of the day, dictionary and thesaurus along with other changing information.
Dictionary.com is from ask.com and has fun and games and language resources.
YourDictionary.com is simple and can be followed on that new popular item, Twitter.
TheFreeDictionary.com is like some of the other sites but it has a fun hangman game and a spelling bee with different levels.
OnlineDictionary.com has definitions from the 1913 Webster dictionary and the WordNet Dictionary.
I hope you can find your favorite online dictionary. I know I did.