What is meant by defeasibility in an argument?

Defeasibility in an argument refers to the notion that an argument can be weakened or rendered invalid when new information or evidence is presented. This concept acknowledges that arguments are not always permanently robust; instead, they may lose their strength in light of fresh insights that counter the original premises or conclusions. This characteristic is crucial in discussions and debates, as it allows for the evolution of understanding and encourages participants to remain open to new evidence. Therefore, accepting the notion of defeasibility encourages a more dynamic approach to argumentation, fostering a culture of critical thinking and adaptability in discourse.