Final answer:
A division of the assembly is out of order when another member has the floor.
Step-by-step explanation:
In the context of parliamentary procedure, a division of the assembly would be considered out of order when another member has the floor. When a member has the floor, it means that they have been recognized by the presiding officer and are speaking or presenting their viewpoints on an issue. During this time, it is generally not appropriate for another member to call for a division, which is a formal vote to determine the sense of the assembly on a particular matter. This is to ensure that the member speaking is able to express their thoughts without interruption.