2. On-line dictionaries

Here you can choose from a list of free on-line dictionaries:

Cambridge Dictionaries on-line This has links to several dictionaries.

Cambridge Advanced Learner’s Dictionary

Oxford Advanced Learner’s Dictionary

Macmillan Dictionary

Merriam-Webster Dictionary

The Free Dictionary

Hi James

Here are just a couple other links to online dictoinaries:

definr :: incredibly fast english-english dictionary
bab.la :: english-german dictionary and vocab. trainer
confusing words :: troubleshooter for confusing words
urban english :: the slang dictionary
webtranslate :: just another average english-english dictionary

Hope some of them are helpful or even fun to test. I love the urban English dictionary!
Mike