As a history and philosophy major, I have to go through a battery of names and concepts in class in order to understand the more advanced concepts. I don’t think I would be able to complete half the background work that I do without Wikipedia, which turned ten today.
But there is a political point to be made here too:
Wikipedia is borne out of a Hayekian concept of gathering knowledge to delineate and synthesize the most efficient definitions possible. Decentralizing works, kids. (Or at least saves substantial time from sifting through Websters.)