This is the 2795th most frequent Japanese word.
還元
"Kan'gen" (還元) means "reduction" or "return to original state."
還元 is used here to mean 'refund' or 'return,' indicating a financial benefit given back to the user.
このクーポンを使うと、購入金額の一部が還元されます。
By using this coupon, part of the purchase amount will be refunded.
還元 is used in this context as a scientific term referring to reduction in a chemical reaction.
科学の授業で酸化還元反応について学びました。
In science class, we learned about oxidation-reduction reactions.
還元 is applied metaphorically here to mean 'return' or 'give back,' emphasizing the societal benefit of one's actions.