An aught is nothing or zero.
You might not use "aught" every day, but it's a helpful word when talking about lack of something. For example, if someone asks how much money they'll get for a broken item and you say "an aught," that means the item is worthless, worth nothing at all. Some people also use "aught" in poetry or formal writing to emphasize the idea of complete absence, like "in a place where there's not aught but silence."
(archaic or dialectal) Anything whatsoever, any part.
Example: for aught I know/care
