Final answer:
A group with no specific purpose or leader is often described using terms like aggregate or crowd, and may also be acephalous in structure, operating via informal consensus.
Step-by-step explanation:
When no specific purpose or target has been specified for the grouping, we are often referring to a scenario that lacks a clearly defined objective or structure. This could relate to various social arrangements where the members of a group interact without formal roles or predetermined goals. For instance, when describing a social gathering that is spontaneous or does not have a set agenda,
we might use terms like aggregate or crowd to distinguish it from a more organized group. On the other hand, acephalous social structures refer to groups that operate without an official leader, relying on informal consensus among members for decision-making. In the context of research or analysis, such a group might be the subject of preliminary background research to create a broader context for future, more targeted studies.