I learned about Wordnik. Wordnik is an online dictionary. When you search for a word, it searches online and combines everything it finds about that word. It searches from twitter to news feeds. This is good because words change everyday, and with Wordnik you will have an updated meaning of that word.
http://www.nytimes.com/2012/01/01/business/wordniks-online-dictionary-no-arbiters-please.html?partner=rss&emc=rss