I use this all the time. Incidentally, if you open up the Dictionary app itself, you have access to complete Wikipedia as well. I really like the way Apple form

I use this all the time. Incidentally, if you open up the Dictionary app itself, you have access to complete Wikipedia as well. I really like the way Apple formats Wikipedia's pages... they're much cleaner than Wikipedia.org. And yes, the pages are current... it's just that Dictionary app uses a different CSS sheet.