再生|さいせいsaisei[0]heiban (flat)

JLPT N1approx.Common
Definitions
  1. noun, suru verb, transitive verb, intransitive verbrestoration to life; coming to life again; resuscitation; regeneration
  2. noun, suru verb, intransitive verbreformation; rehabilitation
  3. noun, suru verb, transitive verbrecycling; reclamation; recovery
    私わたしたちは再生さいせい可能かのうなエネルギー源えねるぎーげんを開発かいはつする必要ひつようがある。↗
    We must develop renewable energy sources.
  4. noun, suru verb, transitive verbplayback; regeneration (of video or sound); views (of an online video)
    録音ろくおんが終おわったらそれを再生さいせいして聞きかせてください。↗
    Please play it back for me after you've finished the recording.
  5. noun, suru verb, transitive verb, intransitive verb, biologyregeneration (of lost or damaged tissue); regrowth
  6. noun, suru verb, transitive verbrebirth; reincarnation
  7. noun, suru verb, transitive verb, intransitive verb, psychologyrecall (memory); retrieval
Conjugation
Dictionary form再生する(さいせいする)
Polite (masu)再生します(さいせいします)
Negative (nai)再生しない(さいせいしない)
polite (masen)再生しません(さいせいしません)
classical zu / nu再生せず・再生せぬ(さいせいせず・さいせいせぬ)
Past (ta)再生した(さいせいした)
polite (mashita)再生しました(さいせいしました)
Past negative (nakatta)再生しなかった(さいせいしなかった)
polite (masen deshita)再生しませんでした(さいせいしませんでした)
Te form再生して(さいせいして)
Potential再生できる(さいせいできる)
Passive再生される(さいせいされる)
Causative再生させる(さいせいさせる)
Causative passive再生させられる(さいせいさせられる)
Conditional (ba)再生すれば(さいせいすれば)
tara再生したら(さいせいしたら)
Volitional再生しよう(さいせいしよう)
polite (mashou)再生しましょう(さいせいしましょう)
Imperative再生しろ(さいせいしろ)

Common forms generated by rule; see the senses for honorific or irregular usage.

Synonyms & antonyms
  • Synonym更生こうせいNeutralCenters on people and organizations: an offender going straight or a company rebuilding itself; for recycling materials, 「再生」 is the usual word, as in 「再生紙」.
  • Related転生てんせいWrittenWritten word for the soul passing into a new body — reincarnation, with a religious or fantasy flavor, as in 「異世界転生」.
  • Related更新こうしんNeutralRenewing or replacing with something new, and beating a record, as in 「契約更新」; the point is making things new, not revival or recycling.
  • Related刷新さっしんWrittenWritten word for a thorough overhaul, as in 「人事の刷新」; it stresses sweeping change, not bringing something back to life.
  • Related再現さいげんNeutralRecreating or reproducing something from the past, as in 「事故の再現」; it means presenting something again, not reviving or recycling it.
  • Related更改こうかいWrittenLegal term for revising or renewing a contract; it belongs to formal paperwork and does not cover revival or recycling.
  • Related一新いっしんNeutralMaking everything fresh, as in 「気分を一新」; it stresses a total renewal of the whole, not a return to life or reuse of materials.
  • Antonym死滅しめつWrittenWritten word for dying out completely, i.e. extinction; it is the opposite of 再生 in its sense of coming back to life.

Use 「再生」 for coming back to life, playing videos, and recycling, as in 「再生紙」. For reforming oneself pick 「更生」, for reincarnation 「転生」, for renewal 「更新」, for recreating the past 「再現」, for a fresh start 「一新」; 「死滅」 is its opposite.

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

Japanese definitions
  1. 再ふたたび生いきる、生いかすこと。復活ふっかつ、蘇生そせい、回生かいせい、転生てんしょう。
  2. 廃棄はいき、中断ちゅうだん、廃止はいしされる、あるいは衰退すいたいするなどして使つかえない状態じょうたいから再ふたたび使つかえる状態じょうたいに戻もどすこと。リサイクル。→都市とし再生さいせい。
  3. 怪我けが、破損はそんするなどで失うしなった部分ぶぶんを修復しゅうふくすること。
  4. 過去かこに収録しゅうろくした映像えいぞうや音声おんせいなどを復元ふくげんして再現さいげんすること。→ビデオ、動画どうが、テレビ、ラジオ
Kanji in this word
English equivalents
See also

JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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