勢い

ikioi
power, force, energy, strength

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I was trying to figure out how 勢い differed from 強さ (tuyosa, strength, power) or other words that can mean 'power' in Japanese (including パワー (pawaa, power), I suppose), when I checked out the character itself: 勢. It also carries the connotation of 'military strength'. That's unique to it.