セイ ゼイ 
いきお.い はずみ 
() force () momentum () military strength
                   
いきおい (adv,n) (1) force, vigor, vigour, energy, spirit, life, (2) influence, authority, power, might, (3) impetus, momentum, course (of events), (n-adv) (4) naturally, necessarily
はずみ (n) (1) bounce, spring, rebound, (2) momentum, inertia, (3) spur of the moment, impulse
せいりょく (n) influence, power, might, strength, potency, force, energy

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Etymologies: 中文字譜 : 説文解字