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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