How to say "overnight" in Japanese

• 一夜いちやCommon
  noun, adverbA somewhat literary word for a single night — 'one night', 'overnight', also 'one evening' — treating the night as one unit. In everyday speech about staying the night, 一晩 is the more natural choice.
  彼かれらは海岸かいがんで一夜いちやを明あかした。↗

  They spent the night on the beach.
• 一躍いちやくCommon
  adverb, noun, suru verbThe figurative 'overnight': suddenly, instantly, as in rising to fame. It describes how quickly something happens, not an actual night, so it never refers to spending or staying a night somewhere.
  彼女かのじょは一躍いちやく有名ゆうめいになった。↗

  She suddenly became famous.
• 一晩ひとばんCommon
  noun, adverbThe everyday word for a literal night: to stay overnight somewhere, or for something lasting all night. Use this whenever 'overnight' refers to an actual night rather than figurative suddenness.

Use 一晩 for an actual night spent somewhere or an action lasting all night, 一夜 for a single night in a more literary style, and 一躍 only for the figurative 'overnight' of sudden success.

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

• 一夜いちやone night
• 一躍いちやくsuddenly (rising to fame, etc.)
• 夜来やらいovernight
• オーバーナイトovernight
• 夜用よるようnighttime use
• 宵越しよいごし(kept) overnight
• 一晩ひとばんall night