The word "部队" is formed through the logical combination of two meaningful characters: "部" (bù), which conveys the idea of a section, department, or organized part of a whole, and "队" (duì), which means a team, line, or organized group of people. By joining them, the concept evolves from simply "a group" to specifically "an organized sectional group", which in practical usage has come to denote a large, organized military unit or army forces. The formation is essentially a semantic synthesis where the combined meaning of the parts creates a new, more specific compound concept.