Most people install gdict. It's the 1913 dictionary supplemented by much updating from more modern sources. There are many others available as well. I assume that you know that a local dictionary, such as gdict is not very useful unless you have also installed the server, dictd. If I knew what distro you intended to run it on, that would be helpful for more specific suggestions.
In Debian ... "aptitude search dict" will offer a multitude of options.
Last edited by rickh; 05-04-2007 at 12:45 PM.