defeasible argument

A defeasible argument is an argument that can be overturned or revised if new evidence or reasons emerge. Think of it as a provisional conclusion based on current information, which remains open to change. For example, you might initially believe a store is open because it’s posted on the door, but if you later find out the hours have changed, your belief is defeated. In essence, defeasible arguments are adaptable—favoring the best explanation available until better reasons or facts challenge them.