Which term describes assumptions or presuppositions that support an argument's warrant?

The term that describes assumptions or presuppositions that support an argument's warrant is backing. In the context of argumentation, a warrant is the reasoning that connects the support or data to the claim. Backing provides additional support to the warrant itself by offering underlying principles or norms that justify the reasoning. Essentially, backing helps to strengthen the warrant by revealing the foundational assumptions that make the argument persuasive and credible.

In summary, backing enhances the reliability of the argument by ensuring that the warrant is grounded in accepted beliefs or principles, thereby solidifying the link between the evidence provided (the data) and the conclusion drawn (the claim).