time machine

a theoretical apparatus that would convey one to the past or future.


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World English Dictionary
time machine
(in science fiction) a machine in which people or objects can be transported into the past or the future

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
As soon as this time machine is built, time travel will commence, and continue
  to exist until someone turns off the machine.
Our sense of hearing, however, must rank a close second as a time machine.
The book was a revelation, a time machine to the era of wooden ballparks, day
  games and legal spitballs.
There is no scientific time machine only an imaginative one.
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