To close the meeting when no motion is pending and there is no further business is called?

The appropriate term for closing a meeting when no motion is pending and there is no further business to address is "Adjourn." This term indicates the formal ending of a meeting, signaling that participants can leave or that the meeting is over for that session. It’s commonly used in parliamentary procedure and signifies that the group has completed its agenda or discussions without any unresolved matters.

The other terms, while they may suggest a closing of a gathering, do not have the specific parliamentary meaning associated with "adjourn." "End session" and "close assembly" are less formal and do not necessarily follow the structured rules of parliamentary procedure. "Terminate" also lacks the formal connotation of being an official closure recognized in meeting protocols, making "Adjourn" the correct term in this context.