Primum-mobile meaning

prī'məm mō'bə-lē', prē'məm mō'bĭ-lā'
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.
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In the Ptolemaic system, the tenth and outermost concentric sphere, revolving from east to west around the earth and causing all celestial bodies to revolve with it.
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(historical) The outermost sphere of the heavens in Ptolemaic astronomy.
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(theology, philosophy) The prime mover or first cause.
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Origin of primum-mobile

  • 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)
    From American Heritage Dictionary of the English Language, 5th Edition
  • Post-classical Latin (from Latin prÄ«mum neuter of prÄ«mus "˜first' + mōbile, from mobilis "˜mobile'), translating Arabic.
    From Wiktionary