noun
General term for force, vigor, or momentum. Often used in compounds like 勢力 (influence/power) or 勢い (momentum).
彼の勢に押されて、つい承諾してしまった。
Overwhelmed by his forcefulness, I ended up agreeing.
そのチームは勢に乗って連勝した。
The team rode their momentum to a winning streak.
noun
military strength; troops; army
Refers to armed forces or military power. Often used in historical or formal contexts, such as 軍勢 (military forces) or 敵勢 (enemy troops).
敵の勢は数万に及んだ。
The enemy forces numbered in the tens of thousands.
勢を整えて出陣した。
They marshaled their troops and set out for battle.