jisho.org is great online dictionary. It evens have example sentences.

I agree with Kida, " Jisho.org " is a suuuper awesome website! It even shows eeevery single Kanji with their strokes and all the possible meanings! I would also recommend the Google Chrome extension 'Rikai Kun' and the Mozilla Firefox extension 'Rikai Chan' which comes in more handy when you are looking for the meaning of a single word or phrase as quickly as possible! [Download] Rikai Kun: https://chrome.google.com/webstore/detail/rikaikun/jipdnfibhldikgcjhfnomkfpcebammhp?hl=en [Download] Rikai Chan: https://addons.mozilla.org/en-US/firefox/addon/rikaichan/ Hope my answer was helpful too! (^_^)/

TanoshiiJapanese.com has a great dictionary! I always use it :)