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1[mass noun] A state in which movement or action is or appears to be continuous and unceasing.‘the planet is in perpetual motion’‘the perpetual motion of the dance floor’
- ‘He is in perpetual motion.’
- ‘So, it is not good sense to interpret the state of an electron in a stationary orbital as perpetual motion.’
- ‘Further, Leucippus proposed that atoms remain in perpetual motion.’
- 1.1The motion of a hypothetical machine which, once activated, would run forever unless subject to an external force or to wear.‘the age-old quest for the secret of perpetual motion’[as modifier] ‘a perpetual motion machine’
- ‘The Constitution was designed, like a perpetual motion machine, to run by itself.’
- ‘If some vital force were present, he argued, then perpetual motion would become possible.’
- ‘The perpetual motion machine kept his interest for half a minute before he sighed, looking over at another item.’
- ‘Dear Sir, I have come across an electronic device, which is called a perpetual motion machine.’
- ‘A more scientifically minded skeptic might refer to the eternal quest for a perpetual motion machine.’
- ‘Physics professors receive packages purporting to show how to build perpetual motion machines.’
- ‘They'd be converting bicycle factories in third world countries to turn out millions of perpetual motion machines within a few weeks.’
- ‘In other words, nature forbids the perpetual motion machine.’
- ‘These findings frustrated the believers of a perpetual motion machine, and angered the industrial tycoons who sponsored the whole endeavor.’
- ‘Do I think a perpetual motion machine will ever be invented?’
- ‘Exactly the same principle of science forbids reptile feathers as forbids perpetual motion machines.’
- ‘Next thing you know, we'll find out that these firms are working on cold fusion and perpetual motion machines.’
- ‘There are also people who call themselves physicists and engineers who promote perpetual motion machines.’
- ‘But what do you do with a request for a perpetual motion machine?’
- ‘If you take on smaller clients you might even get board games, household gadgets and perpetual motion machines.’
- ‘Next he is going to work on a perpetual motion machine.’
- ‘On another occasion a man turned up at the studios with a perpetual motion machine.’
- ‘Unless it has cold fusion or perpetual motion, it isn't worth it.’
- ‘Typically, he carefully avoids the claim that he's tapped into the age-old secret of perpetual motion.’
- ‘But this seems like a perpetual motion machine.’
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