Final answer:
Authority in the context of delegation is best defined as 'The right to act or command the action of another.' It represents the power to make decisions and enforce obedience within a recognized hierarchy, and it must be seen as legitimate by those subject to it.
Step-by-step explanation:
The phrase that most clearly defines "authority" as it applies to delegation is "The right to act or command the action of another." Authority is the power to give orders, make decisions, and enforce obedience. It stems from a recognized and accepted position within a hierarchy, such as a manager in a company who has been granted the ability to assign tasks and expect them to be carried out.
In a hierarchical structure, such as a bureaucratic organization, this authority is what maintains order and ensures that responsibilities are appropriately delegated from higher levels down to lower levels. Individuals with authority are not only in a position to delegate tasks but also to make decisions within their jurisdiction. It is essential as well that the exercise of authority is seen as legitimate by those who are subject to it, which is what separates mere power from recognized and respected authority.