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Ratification is a principal's approval of an act of its agent where the agent lacked authority to legally bind the principal.[clarification needed] Ratification defines the international act whereby a state indicates its consent to be bound to a treaty if the parties intended to show their consent by such an act. In the case of bilateral treaties, ratification is usually accomplished by exchanging the requisite instruments, while in the case of multilateral treaties the usual procedure is for the depositary to collect the ratifications of all states, keeping all parties informed of the situation. The institution of ratification grants states the necessary time-frame to seek the required approval for the treaty on the domestic level and to enact the necessary legislation to give domestic effect to that treaty.The term applies to private contract law, international treaties, and constitutions in federations such as the United States and Canada.
In contract law, the need for ratification can arise in two ways: where the agent attempts to bind the principal despite lacking the authority to do so, and where the principal authorizes the agent to make an agreement, but reserves the right to approve it. An example of the first situation is where an employee not normally responsible for procuring supplies contracts to do so on the employer's behalf. The employer's choice on discovering the contract is to ratify it or to repudiate it.
The other situation is common in trade union collective bargaining agreements. The Union authorizes one or more people to negotiate and sign an agreement with management. A collective bargaining agreement can not become legally binding until the union members ratify the agreement. If they do not approve it, the agreement is of no effect, and negotiations resume.
Ratification of an international treaty
The ratification of international treaties is always accomplished by filing instruments of ratification as provided for in the treaty. In most democracies, the legislature authorizes the government to ratify treaties through standard legislative procedures (i.e., passing a bill).
In India, the President makes a treaty in exercise of his executive power and no court of law in India can question its validity. From a 1951 Calcutta High Court decision (Union of India v. Jain): “Making a treaty is an executive act and not a legislative act" 
In the UK, treaty ratification was a Royal Prerogative, exercised by Her Majesty on the advice of her Government. But, by a convention called the Ponsonby Rule, treaties were usually placed before parliament for 21 days before ratification. This was put onto a statutory footing by the Constitutional Reform and Governance Act 2010.
In the US, the treaty power is a coordinated effort between the Executive branch and the Senate. The President may form and negotiate, but the treaty must be advised and consented to by a two-thirds vote in the Senate. Only after the Senate approves the treaty can the President ratify it. Once a treaty is ratified, it becomes binding on all the states under the Supremacy Clause. While the United States House of Representatives does not vote on it at all, the requirement for Senate advice and consent to ratification makes it considerably more difficult in the US than in other democratic republics to rally enough political support for international treaties. Also, if implementation of the treaty requires the expenditure of funds, the House of Representatives may be able to block, or at least impede, such implementation by refusing to vote for the appropriation of the necessary funds.
In the US, the President usually submits a treaty to the Senate Foreign Relations Committee (SFRC) along with an accompanying resolution of ratification or accession. If the treaty and resolution receive favorable committee consideration (a committee vote in favor of ratification or accession) the treaty is then forwarded to the floor of the full U.S. Senate for such a vote. The treaty or legislation does not apply until it has been ratified. A multilateral agreement may provide that it will take effect upon its ratification by less than all of the signatories. Even though such a treaty takes effect, it does not apply to signatories that have not ratified it. Accession has the same legal effect as ratification. Accession is a synonym for ratification for treaties already negotiated and signed by other states. An example of a treaty to which the U.S. Senate did not advise and consent to ratification is the Treaty of Versailles, which failed to garner support due to inclusion of the Covenant of the League of Nations.
The U.S. can also enter into international agreements by way of executive agreements. These are not made under the Treaty Clause, and do not require ratification of two thirds of the Senate. "Congressional-executive agreements" are passed by a majority of both houses of Congress as a regular law. If the agreement is completely within the President's constitutional powers, it can be made by the President alone without Congressional approval; however, it will have the force of an executive order and can be unilaterally revoked by a future President. All of these types of agreements are treated internationally as "treaties". See Foreign policy of the United States#Law.
In Australia, power to enter into treaties is an executive power within Section 61 of the Australian Constitution. Thus the Australian Federal Government may enter into a binding treaty without seeking parliamentary approval. However, implementation of treaties does require legislation by Federal parliament, following Section 51(xxix) of the Australian Constitution and signed by the Governor-General of Australia.
In Japan, in principle both houses of the parliament (the National Diet) must approve the treaty for ratification. In the event the Upper House (House of Councilors) rejects a treaty approved by the Lower House (House of Representatives) and a joint committee of both houses cannot come to agreement on amendments to the original text of the treaty, or the Upper House fails to decide on a treaty for more than thirty (30) days, by the Constitutional supremacy of the House of Representatives the decision by the Lower House will be regarded as the vote of the National Diet approving the ratification. The approved treaty will then be promulgated into law by the Constitutional act of the Emperor.
Ratification of a constitution
Federations usually require the support of both the federal government and some given percentage of the constituent governments for amendments to the federal constitution to take effect.
Ratification in the United States Constitution
Article Seven of the constitution of the United States describes the process by which the entire document was to become effective. It required that conventions of nine of the thirteen original States ratify the constitution. If fewer than thirteen states ratified document, it would become effective only among the states ratifying it. New Hampshire was the ninth state to ratify, doing so on June 21, 1788, but, as a practical matter, it was decided to delay implementation of the new government until New York and Virginia could be persuaded to ratify. Congress intended that New York City should be the first capital, and that George Washington, of Mount Vernon, Virginia, should be the first President, and both of those things would have been somewhat awkward if either New York or Virginia were not part of the new government. Ratification by those states was secured, and the government under the Constitution began on March 4, 1789.
For subsequent amendments, Article Five describes the process of a potential amendment's adoption. Proposals to adopt an amendment may be called either by a two-thirds vote by both houses of Congress or by a national convention as a result of resolutions adopted by two-thirds (presently at least 34 out of 50) of the states' legislatures. For an amendment to be adopted, three-quarters of the states (presently at least 38 out of 50) must ratify the amendment either by a vote of approval in each state's legislature or by state ratifying conventions – Congress may specify which method must be used to ratify the amendment. Congress may also set a deadline by which the threshold for adoption must be met.
- "Glossary of terms relating to Treaty actions". United Nations.
- An example for such a treaty can be seen in the Convention on Cluster Munition. It will enter into force as soon as it has been ratified by at least 30 states. See Article 17 of the Convention on Cluster Munitions.
- United Nations Treaty Collection, Treaty Reference Guide(1999)
- U.S. Const. art. VII.