Amendment Process Definition Amendment: a formal revision to the Constitution, responding to needs of a changing nation. Formal Amendment Process To Propose an amendment: Requires 2/3 vote of both Houses of Congress (Senate and House of Reps) OR Requires a national convention requested by 2/3 of the state legislatures. Formal Amendment Process To ratify (make official) an amendment: Must receive approval by 3/4 of state legislatures OR Acceptance by conventions in 3/4 of states The Amendments Bill of Rights: The first 10 amendments These amendments were added in order to protect the people from the government. The Rest of the Amendments were added over the past 200 years for varying circumstances.