The word 大部分 is formed through a logical, conceptual assembly of its three component characters. It begins with 部, meaning "part" or "section", establishing a core idea of a segment of a whole. This is then directly modified by 大 ("big" or "large") to specify that this part is a large one. Finally, the character 分, which carries meanings of "division", "portion", or "share", is appended to reinforce and clarify that this large part is specifically a divided portion or allocated segment of the whole. Thus, the formation visually and notionally constructs the idea of a "large divided section", arriving at the meaning of "the majority" or "most of".