An authorized substitute is a person who is given the authority to act on behalf of another person. In this case, the term 'PROXY' is used to describe an authorized substitute. A PROXY is someone who is appointed to represent another person in a legal or business transaction. This type of arrangement is often used when one person is unable to attend a meeting or sign a document. The PROXY is then able to act on behalf of the other person and make decisions in their stead.