Perpetual motion machine definitions

perpetual motion machine

[n] - a machine that can continue to do work indefinitely without drawing energy from some external source
Found on http://www.webdictionary.co.uk/definition.php?query=perpetual%20motion%20ma

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perpetual motion machine

noun a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy
Found on https://www.encyclo.co.uk/local/20974

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