If you haven't discovered Tag Galaxy yet, you should go have a play right now.
Just type in a word and the site uses it to create your very own galaxy of Flickr images, all based around that term. In the centre is your original entry, but then orbiting around it are lots of similar terms, allowing you to explore related themes.
Tag Galaxy is a great way to bring an idea to life and explore it further. If I worked on a brand that was all about "Joy", for example, just a couple of clicks gives me a whole planet made out of the stuff:
With the option of diving off into space, to look at some of the things that Joy is related to:
Much more inspiring than a dictionary, hey? And even more fun if you try it with brand names...