primum mobile
American Heritage Dictionary:
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pri·mum mo·bi·le
(prī'məm mō'bə-lē', prē'məm mō'bĭ-lā') 
n.
n.
- The tenth and outermost concentric sphere of the universe thought in Ptolemaic astronomy to revolve around the earth from east to west in 24 hours and believed to cause the other nine spheres to revolve with it.
- See prime mover (sense 1).
[Medieval Latin prīmum mōbile : prīmum, neuter of prīmus, first + mōbile, from neuter of mōbilis, movable (translation of Arabic al-muḥarrik al-'awwal : al-, the + muḥarrik, mover + 'awwal, first).]
Oxford Dictionary of Philosophy:
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primum mobile
(Latin, first in movement) In Aristotelian cosmology the first or outermost sphere of the heavens. The perfect, spherical rotation of this sphere is directly activated by love of God; the motion is as like the life of God as movement can be. See mover, unmoved.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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