A more thorough explanation:

Definition: In Ecclesiastical law, a cursor is an inferior officer of the papal court.

Example: The cursor was responsible for carrying out administrative tasks within the papal court, such as delivering documents and messages.

Explanation: The example illustrates how a cursor is a lower-ranking official within the papal court who performs various administrative duties. They are responsible for carrying out tasks assigned to them by higher-ranking officials and ensuring that the court runs smoothly.