What is amendment?
amendment meaning A proposal by a Member (in committee or floor session of the respective Chamber) to alter the language or provisions of a bill or act. It is voted on in the same manner as a bill. The Constitution of the United States, as provided in Article 5, may be amended when two-thirds of each House of Congress approves a proposed amendment and three-fourths of the states thereafter ratify it.
reference: Ben’s Guide U.S. Government – Glossary