The word 武器 is formed by combining two meaningful characters: 武 (wǔ), which conveys ideas of military, martial, or forceful action, and 器 (qì), which means tool, utensil, or instrument. Their conceptual fusion is direct and logical: a "military tool" or an "instrument of force", which naturally and collectively denotes the modern meaning of "weapon". This is a classic example of Chinese compound word formation where the combined sense of the parts creates a specific, unified concept.