This meaning refers to actively serving in a specific role or position, usually within an organization or institution. It implies a sense of duty and commitment to the responsibilities associated with that role.

This usage indicates performing duties or functions in a particular capacity, often in a specific location or organization, such as a governmental or public institution.

This meaning is used when someone is occupying a formal position or title, often within a governmental or organizational context, indicating that the individual has a recognized role and responsibilities.