A letter of delegation is a document that grants an individual or group the authority to act on behalf of another person or entity. Synonyms for this type of letter include authorization letter, power of attorney, proxy, delegation letter, mandate letter, and appointment letter. These terms are often used interchangeably and can refer to different types of delegations depending on the specific context. For example, a power of attorney is a legal document that grants someone the authority to make decisions for another person in specific legal or financial matters, while a proxy may refer to a temporary delegation of authority for a specific event or task. Regardless of the term used, a letter of delegation is an important tool for empowering individuals to act on behalf of others and can be an effective way to streamline decision-making and improve efficiency.