The word "协定" is formed through the combination of two meaningful characters: "协" (xié), which conveys the idea of cooperation, joint action, or harmony, and "定" (dìng), which carries the meaning of deciding, settling, or fixing something. Their union is semantic, creating a new, composite concept where "定" (to decide) is performed in a "协" (cooperative) manner. Thus, the term conceptually fuses "jointly" with "decided", naturally arriving at the meaning of a formal agreement or pact reached through mutual consultation.