Well many a times I needed some help with word meaning and it became quite hectic to search each word on google (which I mostly did.). But then I came across this website. Loads up fast, great interface, an interactive one. Has word games. I would recomend this site to all those who want to work on there english (well of course, beside reading stuffs).

Moreover it has a great database in different languages too. So if you are trying to learn some language by yourself, this site can help you in that.
Spanish Dictionary
German Dictionary
French Dictionary
Italian Dictionary
Arabic Dictionary
Chinese Dictionary (S)
Polish Dictionary
Portuguese Dictionary
Dutch Dictionary
Norwegian Dictionary
Greek Dictionary
Russian Dictionary
Turkish Dictionary