I think that a more useful hint would be that you can use Google (and the Google search box in Safari) as a dictionary. Just type in "define: word". That way if you already have Safari running you don't have to wait for Dictionary to launch. Google also deals with mis-spellings better and has a larger database of definitions in my experience.

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The one benefit to doing it with the dict:/// method is that it doesn't require you to be online. As others have mentioned, it's still probably easier to just hit cmd-ctrl-d, even if you have to type out the word in the location bar of Safari.

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