Here, in discussing one of the lower denominations of atheism, PZ's "dictionary atheists", who depending on whom you ask, may or may not be True Atheists™, this guru gives the A+ view on dictionaries:
I don't think dictionaries describe the meaning of words. They summarise the primary usages of words in a way that is traditionally limited by the amount of space available in a printed dictionary. Even then they cannot do justice to what a word means. The meaning of all words is flexible and subjective. If I agree any meaning, it is purely for the sake of argument.These special people will surely change the world. I can feel it changing. Watch out!