This is the 1152nd most frequent Japanese word.
勢力
"勢力" (せいりょく) - Influence, power, or force.
勢力 is used to denote the 'influence' or 'power' of the company within a competitive context.
新興企業が市場における勢力を増している。
The startup is increasing its influence in the market.
勢力 here refers to the 'force' or 'intensity' of the natural phenomenon, contextualized within meteorology.
台風が勢力を弱めながら日本に接近中です。
The typhoon is approaching Japan while weakening its intensity.
勢力 is used to describe 'factions' or 'forces' in the political context indicating groups with shared influence.