primum mobile
UK /ˌpɹaɪməm ˈməʊbɪli/ · US /ˌpɹaɪməm ˈmoʊbəˌli/ noun
Forms primum mobiles prima mobilia
- noun (astronomy, historical) The outermost celestial sphere of the heavens in Ptolemaic astronomy, which was believed to cause all the inner spheres to rotate.
- noun (chiefly philosophy, theology) The prime mover or first cause (“an initial cause from which all other causes and effects follow”).
- noun (by extension) The person or thing that is the main impetus for some action; a driving force.
Synonyms
Etymology
From Middle English primum mobile (“outermost celestial sphere causing other spheres to move”), borrowed from Medieval Latin prīmum mōbile (literally “first mover”), a calque of Arabic مُحَرِّك أَوَّل (muḥarrik ʔawwal, “first mover”), which is itself a calque of Ancient Greek τὸ πρῶτον κινῆσαν (tò prôton kinêsan, “prime mover”).
Webster’s 1913
- In the Ptolemaic system, the outermost of the revolving concentric spheres constituting the universe, the motion of which was supposed to carry with it all the inclosed spheres with their planets in a daily revolution from east to west. See Crystalline heavens, under Crystalline.
Etymology [L., first cause of motion.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “primum mobile”, CC BY-SA 4.0. Details