Which motion concerns matters of immediate and overriding importance that should interrupt the consideration of anything else?

The motion that addresses matters of immediate and overriding importance is the privileged motion. This type of motion takes precedence over other motions because it relates to urgent issues that must be dealt with immediately, often to ensure the safety, rights, or welfare of the members and the organization. For example, if a situation arises that demands urgent attention, a privileged motion can interrupt ongoing business to address this critical matter.

In contrast, incidental motions deal with procedural aspects and relate to the main motion without interrupting its consideration. Subsidiary motions assist in modifying or disposing of other motions but do not possess the same urgency as privileged motions. Main motions introduce new business or topics for discussion but do not take precedence over more pressing issues. Thus, the unique characteristic of privileged motions lies in their ability to address urgent matters, which justifies their priority in any assembly's proceedings.