Which term describes a disagreement raised about a claim?

The term that describes a disagreement raised about a claim is "challenge." This term specifically refers to the act of questioning the validity or truth of a statement or assertion made by someone else. In a debate or argumentative context, a challenge serves as a key mechanism for engaging with the claims presented, prompting further discussion, clarification, or counterarguments.

In contrast, an implied premise deals with an unstated assumption that must be accepted for an argument to hold. A complex argument involves multiple claims or premises that may require deeper analysis but does not directly denote a disagreement. Flowing is a technique used in debate to keep track of arguments and responses but does not pertain to the act of raising a disagreement itself. Therefore, "challenge" is the most accurate term to describe the disagreement raised about a claim.