Yes, here we are at the end of a list of fifty words you've probably been pronouncing incorrectly, and now we're telling you that you've even been getting the word you use to refer to it wrong, too. We're really very sorry.
When you look at "pronunciation", there's the temptation to say "pro-nown-see-ay-shun", because we associate it so closely with the word "pronounce". Even though this would seem to make sense, this is the English language, and the difference in spelling changes the way it should be said. Look again, and you'll notice the second "o" in "pronounce" isn't there in "pronunciation", so the correct way to start the word would be "pro-nun", like you're in favor of nuns. And who doesn't like nuns? That word in full is "pro-nun-see-ay-shun". Hasn't today been an education?