Ratify/ˈrætɪfaɪ/ Definition 1 of 3Pro Tip 1/3Official Approval Ratify means a formal and official way of giving approval, it's not casual. The treaty was ratified by all member states. Pro Tip 2/3Binding Decision Once ratified, the decision or law becomes binding and enforceable. The amendments to the constitution were ratified last year. Pro Tip 3/3Process Completion Ratification is often the last step in a law-making or decision process. After the ratification, the new policy was implemented.