Subdivision/ˈsʌbdɪvɪʒn/ Definition 1 of 4Pro Tip 1/2Conceptual Divisions Subdivision can imply orderly segments within a complex structure or content. The textbook's subdivision on ancient history is remarkably detailed. Pro Tip 2/2Hierarchy of Parts Smaller subdivisions often fit into a larger, overarching category. Each subdivision of the curriculum corresponds to a specific academic department.