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反作用 (はんさよう) Japanese meaning | Kotomora
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きさ
が
等ひと
しく
、
向む
き
が
反はん
対たい
で
ある
。
Action and reaction are equal in magnitude and opposite in direction.
Kanji 作 make, production, prepare 用 utilize, business, service Related words 反応 is the broader word for any response (physical, chemical, or emotional), while 反作用 specifically denotes an opposing or counter-effect, often in physics.
反作用 is the precise physics term for a reaction force paired with an action (作用・反作用), while リアクション is a looser, more general word for 'reaction' in this technical sense.
Etymology A Sino-Japanese compound combining 反, associated with opposition or reversal, and 作用, meaning action, operation, or effect. The spelling transparently conveys an effect that occurs in response or opposition.
