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1. Oxford Dictionary

   primum mobile

   • IPA[ˌpriːməm ˈməʊbɪli]

   英式

   • n.
     the most important source of motion or action.；(in the medieval version of the Ptolemaic system) an outer sphere supposed to move round the earth in twenty-four hours carrying the inner spheres with it.

   • noun: primum mobile

2. • 更多解釋

   primum mobile

   • IPA[ˌprīməm ˈmōbəˌlē]

   美式

   • n.
     the central or most important source of motion or action.

   Oxford American Dictionary