I never knew the difference.
Even the a bit vs a lot, doesn't it depend on WHOM is doing the frying/sauteeing?
Not really. Saute means to put a small puddle of oil into the center of the pan, let it head up, and swirl the pan to cover the bottom with the oil, and then toss in whatever you're sauteing.
Frying means to cover the bottom of the pan with oil (and then you can add even more, but that's the minimum), heat it, and add your food.
For example, you fry latkes. You sautee onions. That's the difference.