還元|かんげんkangen[0]heiban (flat)

1. noun, suru verb, transitive verb, intransitive verbrestoration; return
   ゲイツ会長かいちょう、広告こうこく収入しゅうにゅうをユーザーに還元かんげんする意向いこう表明ひょうめい。↗

   Bill Gates announces intent to return advertising revenue to the users.
2. noun, suru verb, transitive verb, intransitive verb, chemistryreduction; resolution; deoxidization; deoxidation

• Synonym復元ふくげんNeutralA noun for restoring something to its original form, e.g. artifacts or data as in 「復元図」; it centers on recreating the original appearance.
• Synonym戻すもどすNeutralThe everyday verb for putting something back or restoring it to its original state; common in speech.
• Synonym復するふくするWrittenA written-style verb for returning to an original state; formal and rarely used in modern Japanese.
• Related回復かいふくNeutralA noun for returning to a former good state, with a broad range like 「体力の回復」; 「還元」 instead covers giving back benefits or chemical reduction.
• Related復旧ふっきゅうWrittenA written-style noun for restoring damaged services or facilities to working order, as in 「復旧工事」; the focus is on usability, not appearance.
• Related立て直すたてなおすNeutralA verb for rebuilding or turning something around, as in 「経営を立て直す」; about improving a weakened state, not giving back.
• Related引き戻すひきもどすNeutralA verb for pulling someone or something back, as in 「現実に引き戻す」; stresses the act of drawing back.
• Related返すかえすNeutralThe everyday verb for returning things; 「利益を返す」 is possible, but giving back profits or benefits is usually said with 「還元」.
• Related取り戻すとりもどすNeutralA verb for taking back something once lost, as in 「自信を取り戻す」; about regaining for oneself, not giving back.
• Related返還へんかんWrittenA formal, written-style noun for returning territory or property to its owner, as in 「領土返還」.
• Related返上へんじょうWrittenA written-style noun for giving back an honor or post, or forgoing something oneself, as in 「休日返上」.
• Related返却へんきゃくNeutralA noun for returning something borrowed or received, as in 「図書の返却」.
• Related返納へんのうWrittenA written-style noun for handing licenses or IDs back to the authorities, as in 「免許返納」.
• Related帰すかえすNeutralA verb for sending a person back or home, as in 「生徒を帰す」; concerns people, not benefits or states.
• Antonym酸化さんかWrittenThe antonym: oxidation, as in 「酸化防止」; the chemical opposite of 「還元」 in its reduction sense.

Use 「還元」 for giving back benefits or gains, as in 「ポイント還元」 and 「利益を還元する」, or for chemical reduction. To restore a good state say 「回復」, to recreate an original form 「復元」, to get facilities working again 「復旧」, and to hand things back 「返す」. 「酸化」 is its chemical opposite.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 根源こんげんの元もとの形かたち、性質せいしつ、状態じょうたいに還かえること。元もとの形かたちに戻もどすこと。
2. 本質的ほんしつてきなものに帰着きちゃくさせること。帰着きちゃくすること。
3. 本来ほんらいは社会しゃかいや特定とくていの団体だんたい、個人こじんなどに帰属きぞくするものと考かんがえ、元もとに返かえすという意識いしきを持もって広ひろく提供ていきょう、共有きょうゆうすること。
4. （化学かがく）原意げんいは、酸化物さんかぶつが酸素さんそを失うしなう化学かがく変化へんかをいう。さらにそこから広ひろがり、化学種かがくしゅが電子でんしを得えること、あるいは、酸化数さんかすうが減へることも還元かんげんと呼よぶ。対義語たいぎごは酸化さんか。