The word 势力 is formed by combining the character 势, which conveys the idea of momentum, influence, or a prevailing power dynamic (like the energy of a situation or a position of advantage), with the character 力, which directly means strength, force, or power. Together, they conceptually fuse the abstract notion of influential position or circumstance with the concrete idea of active force, resulting in a composite meaning that refers to influential power, clout, or a sphere of control exercised by an individual, group, or nation.