My favorite dictionary, meaning web-dictionary, is http://www.macmillandictionary.com because this page has all of the functions that you need, plus the design is ok compared to some of the other ones. Personally I think that a lot of the webpages had too much ad-campaigns and looked rather messy.
Oxfords, Cambridge’s and Collins were all ok, but as I said there were way too much ads. Also I do for some reason prefer red-themed webpages and all three of them were blue.
Even tough I liked macmillan’s the best, http://www.merriam-webster.com was my favorite when it is about design and overview. Merriam-webster had, hands down, the best webpage, but some of the functions did not work. Also at Merriam-webster, there were no ad-campaigns – huge plus.
— Martha S Raaum