Whenever I need a dictionary, an English/Spanish - Spanish/English dictionary (and it is quite often), I use WordReference.com.

I think it is one of the best dictionaries, as far as I know, as you won't just find the translation for a concrete word, but you can also listen to its pronunciation, and the word's description includes common expresions.

More, with every word searh, you'll get all the post including that word on their forum.

Yes, it includes publicity, but I think that's not a big problem.

Talking about Spanish words, if you're looking for a verb, you will also have the option to read the conjugation for that verb.

This dictionary also includes definitions and lists of synonymous.

So, if you need a good online dictionary, try WordReference.com and tell us if you find it useful.

Hope this helps!

Angeles F.