Dictionary/反作用はんさようHansayou反作用 (Hansayou) is a Japanese noun meaning “reaction”.MeaningsnounreactionKanji in 反作用反anti-作make用utilizeRelated words反るto warp返るto return反anti-作るto make必要necessary返すto return (something)用business用意preparation利用use私用personal use信用confidence作品work (e.g. book, film, painting, composition)