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  1. Oxford American Dictionary

    primum mobile

    • IPA[ˌprīməm ˈmōbəˌlē]

    美式

    • n.
      the central or most important source of motion or action.；(in the medieval version of the Ptolemaic system) an outer sphere supposed to move around the earth in 24 hours, carrying the inner spheres with it.

    • noun: primum mobile