The term "definitive" refers to something that is conclusive and leaves no room for doubt. It often describes evidence, decisions, or statements that are final and authoritative. For example, a definitive study on a medical treatment provides clear and convincing results that can guide future practices. In everyday life, we encounter definitive answers that help us make informed choices. For instance, a definitive guide to a subject offers comprehensive information, ensuring that readers understand the topic thoroughly. Such clarity is essential in various fields, from science to law, where certainty is crucial for effective decision-making.