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time capsule

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noun
  1. a receptacle containing documents or objects typical of the current period, placed in the earth or in a cornerstone for discovery in the future.
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Origin of time capsule

First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for time capsule

time capsule

noun
  1. a container holding articles, documents, etc, representative of the current age, buried in the earth or in the foundations of a new building for discovery in the future
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012