1Coming back to life or regaining vitality; the restoration of life or the recovery of something that had lost its vigor or function.
山火事で焼けた森は、数年のうちに緑を取り戻し再生した。
The forest burned in the wildfire regained its greenery and regenerated within a few years.
寂れていた商店街が、住民の努力で少しずつ再生してきた。
The once-declining shopping street has gradually been revived through residents' efforts.
生死の境をさまよった彼だったが、懸命な治療のすえに再生を果たした。
He had hovered between life and death, but through dedicated treatment he was brought back to life.
2The reform and rebuilding of a system, organization, or community — reformation or rehabilitation.
震災後の都市再生計画が市議会で承認された。
The urban redevelopment plan following the earthquake was approved by the city council.
刑務所を出所した人の社会再生を支援するプログラムが始まった。
A program to support the social rehabilitation of released prisoners has started.
3Recycling — collecting and processing materials or resources so they can be used again.
再生紙は古紙を原料として作られる。
Recycled paper is made using used paper as raw material.
工場では金属くずを再生し、新しい部品として利用している。
The factory reclaims scrap metal and uses it to make new parts.
このプラスチック製品は再生可能な素材から作られている。
This plastic product is made from recyclable materials.
4Playing back audio or video; also used for the number of times something (e.g. an online video) has been played.
動画の再生ボタンを押して内容を確認した。
I pressed the play button on the video to check the content.
その曲はYouTubeでの再生回数がすでに一千万を超えている。
That song's play count on YouTube has already exceeded ten million.
録音を再生して発音を確認した。
I played back the recording to check the pronunciation.
5In biology, the regrowth or recovery of lost or damaged tissue or organs; regeneration.
サンショウウオは尾や手足を再生する能力が高い。
Salamanders have a strong ability to regenerate their tails and limbs.
幹細胞研究は人間の組織を再生させる可能性を探っている。
Stem cell research is exploring the possibility of regenerating human tissue.
6Rebirth or reincarnation, used in religious or figurative contexts to mean being born again.
彼は旅を通して人生の再生を感じたと語った。
He said that through his travels he felt a rebirth in his life.
仏教では、死後の再生や輪廻についてさまざまな考え方がある。
In Buddhism, there are various views about rebirth and reincarnation after death.
7In psychology, the recall of memory — retrieving information that has been stored.
試験では、再生よりも再認のほうが簡単だと感じる学生もいる。
Some students find that recognition is easier than free recall on exams.
古い写真を見ると、忘れていた記憶が再生されることがある。
Looking at old photos can sometimes bring forgotten memories back to mind.