English definition of “yet”
BEFORE › before now or before that time: Have you read his book yet? "Has he called?" "No, not yet."
NOW › now or as early as this time: I don't want to go home yet.
the best/worst, etc yet › the best/worst, etc until now: That was my worst exam yet.
be/have yet to do sth › to not have done something that was expected before this time: They have yet to make a decision.
yet again/another/more, etc › used to show that you are surprised or annoyed that something is being repeated or increased: He's given us yet more work to do.
could/may/might, etc yet › used to say there is still a possibility that something will happen: He may win yet.