Final answer:
A ritualistic structure is one that originates from ancient routines and practices with an associated special meaning, serving as a key organizational component within social structures.
Step-by-step explanation:
The structure that has its roots in ancient routines and practices that took on special meaning is a ritualistic structure. This type of structure refers to a ritual repeated, a patterned action that is conventionally associated with particular meanings, often incorporating symbolic objects and actions. Ritualistic structures are part of the larger social structure, serving as the organizational framework for particular realms of culture, such as religion.
Rituals play a significant role in the social structures of societies, organizing important cultural processes and upholding social norms and values. They can be found within families, economies, political systems, and religious observances, acting as the foundational components of culture. These structures are not only an assembly of material culture but also encompass practices and ideas, shaping the way functions like community decision-making, production, and religious activities are conducted.