The word 秩序 (zhìxù), meaning "order" or "sequence", is formed through the combination of two semantically similar characters, each contributing to a unified, abstract concept. The character 秩 originally conveyed the idea of orderly rotation, such as in official posts or agricultural cycles, implying a structured arrangement. The character 序 initially referred to the spatial order of rooms in an ancient hall, extending to mean any logical sequence or precedence. By joining them, the compound reinforces and amplifies the core notion of systematic, harmonious arrangement, where the whole meaning emerges from the conceptual overlap and reinforcement of its parts.