perpetual motion machine

1. 1.

   a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy

   Broadermachine

Questions about perpetual motion machine

What does perpetual motion machine mean?

perpetual motion machine means "a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy".

Is perpetual motion machine a common word?

perpetual motion machine is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.