ウラシマ効こう果か

noun

Urashima effect; time dilation

Slang term for the phenomenon where time passes differently for someone traveling at high speed or in a different frame of reference, named after the Japanese legend of Urashima Tarō. Used in science fiction and popular science contexts.

• 宇う宙ちゅう旅りょ行こうから帰かえってきたら、地ち球きゅうでは何なん十じゅう年ねんも経たっていた。まさにウラシマ効こう果かだ。

  When I returned from space travel, decades had passed on Earth. It's exactly the Urashima effect.