primum mobile - WordReference.com Dictionary of English

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primum mobile

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Concise Oxford English Dictionary © 2008 Oxford University Press:
primum mobile /ˌprʌɪməm ˈməʊbɪleɪ, ˌpriːməm ˈməʊbɪli/

▶noun

1 a prime mover.

2 Astronomy, historical the outer sphere of the Ptolemaic universe, supposed to carry the inner spheres with it.

– origin from med. L., lit. ‘first moving thing’.

'primum mobile' also found in these Oxford entries:

perpetuum mobile

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