noun
time capsule
A container storing objects or information to be opened in the future, often buried at ceremonies or events.
卒業式でタイムカプセルを埋めた。
We buried a time capsule at the graduation ceremony.
このタイムカプセルは50年後に開けられる予定だ。
This time capsule is scheduled to be opened in 50 years.
Variant with interpunct, sometimes used for clarity or in formal contexts.
Borrowed from English 'time capsule'.