The term 'Definitive Word' is a three-letter phrase that refers to a word or phrase that is considered to be the most accurate and authoritative. It is often used to describe a statement or opinion that is considered to be the final and most reliable source of information. This term is often used in legal contexts, where it is important to have a clear and unambiguous understanding of the law. In other contexts, it can refer to a statement or opinion that is widely accepted as being true or correct.