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perpetual motion machine

noun

perpetual motion machine

noun
1

Literature, Media, Natural sciences, Physical sciences, Physics, Pseudoscience, Publishing, Science fiction A hypothetical, pseudoscientific device that exhibits perpetual motion, especially one that does useful work with no input of energy.

Derived terms
perpetual motion machine of the first kind, perpetual motion machine of the second kind

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.