The word "部位" is formed through a logical and semantic combination of its two component characters. The first character, "部" (bù), carries the core meaning of "part", "section", or "division", indicating a segment of a whole. The second character, "位" (wèi), fundamentally means "position", "location", or "place". When combined, the concept fuses into a single, more precise idea: a "specific part" or a "designated position" within a larger structure or area, emphasizing not just any part, but a part defined by its particular location, such as a body part, a spot on a map, or a section of a machine.