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primum mobile

[pree-moo m moh-bi-le; English prahy-muh m mob-uh-lee, pree-] /ˈpri mʊm ˈmoʊ bɪˌlɛ; English ˈpraɪ məm ˈmɒb əˌli, ˈpri-/
Latin.
1.
(in Ptolemaic astronomy) the outermost of the 10 concentric spheres of the universe, making a complete revolution every 24 hours and causing all the others to do likewise.
Origin
literally, first moving (thing)
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for primum mobile

primum mobile

/ˈpraɪmʊm ˈməʊbɪlɪ/
noun
1.
a prime mover
2.
(astronomy) the outermost empty sphere in the Ptolemaic system that was thought to revolve around the earth from east to west in 24 hours carrying with it the inner spheres of the planets, sun, moon, and fixed stars
Word Origin
C15: from Medieval Latin: first moving (thing)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for primum mobile
n.

"the first source of motion," mid-15c., from Medieval Latin (11c.), literally "the first movable thing;" see prime (adj.) + mobile. A translation of Arabic al-muharrik al-awwal "the first moving" (Avicenna).

Online Etymology Dictionary, © 2010 Douglas Harper
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