...but has "anniversary" changed in meaning?An etymological fallacy becomes possible when a word has changed its meaning over time.
This depends on which dictionary you use. The Oxford English Dictionary doesn't extend the meaning to anything other than yearly cycles, but Webster has:...but has "anniversary" changed in meaning?
broadly : a date that follows such an event by a specified period of time measured in units other than years <the 6-month anniversary of the accident>
Looking back to origins of words and trying to realign them with modern usage is not really a good thing to do, the last time this was taken seriously a group of people tried to correct English spelling by throwing Bs in everywhere where they never were before. English took a lot of words from French which never had a 'b' and then when these 'revolutionaries' (I'm sure they thought of themselves as 'restorers') looked back at the Latin roots of words (debitum), they changed our spelling to 'debt' when there was no "B" in there in the first place, coming from Old French 'de(t)te'. (The point here being that looking at etymological roots is pointless considering nobody speaking English has ever seriously pronounced a when saying the word 'debt').Wikipedia said:The etymological fallacy holds, erroneously, that the original or historical meaning of a word or phrase is necessarily similar to its actual present-day meaning. This is a linguistic misconception, mistakenly identifying a word's current semantic field with its etymology
I totally concur, and more so, languages are "living entities" with the ability to grow, transform and die. It does not matter if it borrows terms from other languages or if it modifies them because their usage keeps them alive. In the very core of this thread, knowing a Latin root is good enough for informative purposes, but that doesn't exactly mean that every word containing it will necessarily imply its meaning, as Alx~ has correctly put it!But Alx's point is, precisely, that the 'something' meant by words changes over time. It looks as if we're in the early stages of "anniversary" moving away from a connection with "year".