Language is power--we understand that words can move us to tears or laughter, inspire us to great deeds or urge us to mob action. Dictionaries are the democratization of that power, and the more words they contain, the more democratic they are. The dictionary is a gigantic armory and toolbox combined, accessible to all. It reflects our preoccupations, collects our cultural knowledge, and gives us adorable pictures of aardvarks, to boot. And it does all this one word at a time.