What is the role defined for an individual authorized to execute the principal's business of a particular kind?

The role of a general agent is characterized by their broad authority to act on behalf of the principal in managing a particular business or undertaking. Unlike a special agent, who is typically limited to a specific task or transaction, a general agent has the power to perform any act related to the business specified by the principal. This can include making decisions, engaging in contracts, and overseeing day-to-day operations.

The general agent's capacity to represent the principal across a wide range of activities makes this role crucial in situations where the principal cannot manage every detail personally. Their ability to act autonomously allows for greater efficiency and responsiveness in business operations, as the general agent can deal with various matters without needing constant direction.

In contrast, other roles like a special agent have a restricted scope of authority, a partner typically shares in the profits and losses of a business with others, and an executive officer usually holds a managerial position within an organization rather than acting solely as an agent for a principal. Thus, the definition of a general agent aligns perfectly with the description provided in the question, identifying it as the correct choice.