Free is better than not-free. Here is the harvest of Greek dictionaries available online (both classical and for the New Testament), to help you understand and love God's Word more.
Greek Dictionaries - ReformedBooksOnline
If you don't know Greek, how are you going to read God's Word as He...
There is world of great resources on the net that is little taken advantage of.
Reformed Books Online now has a page of Bible, theological and Church history dictionaries and encyclopedias that will go far in answering most questions about the Bible and Church history.