I was arguing with someone recently — I don't remember who — about the meanings of words. He or she had taken the stance that the only valid definition of a word was its original definition, and that it was wrong for a dictionary publisher to alter the definitions of words to keep up with current usage; I asserted that language changes, get used to it.
Today I learned something surprising about the etymology of a word I hadn't ever given much thought to:
symposium [1580–90; < L < Gk sympósion drinking party, equiv. to sym- SYM- + po- (var. s. of pinein to drink) + -sion n. suffix]
Well, that kind of explains the Buffy symposium.