What term describes the act of putting an end to all debate or action?

The term that describes the act of putting an end to all debate or action is "peremptory." This word is often used in legal and formal contexts to indicate a command or order that does not allow for any refusal or delay. When a statement or action is peremptory, it is authoritative or decisive, leaving no room for discussion or argument.

For instance, a peremptory ruling in a court would mean that the judge's decision is final and must be followed without question. This aligns perfectly with the concept of ceasing all debate and action, as it compels compliance and negates any further discourse on the matter.

In contrast, other terms listed do not convey this specific meaning. "Preternatural" refers to something beyond the natural or normal, "pleat" relates to a fold, and "prim" denotes being overly formal or proper. None of these convey the authoritative and decisive nature associated with ending debate or action.