Primum mobile

[Sarah]

In the Ptolemaic system, the outermost of the revolvingconcentric spheres constituting the universe, the motion of which wassupposed to carry with it all the inclosed spheres with their planetsin a daily revolution from east to west. See Crystalline heavens,under Crystalline.The motions of the greatest persons in a government ought to be, asthe motions of the planets, under primum mobile. Bacon.

[VikaRip]

an agent that is the cause of all things but does not itself have a cause

[Franceswah]

The outermost sphere of the heavens in Ptolemaic astronomy.

[LouissaRini]

The prime mover or first cause.

[Tanya Shivari]

In classical, medieval, and Renaissance astronomy, the Primum Mobile (Latin: first movable) was the outermost moving sphere in the geocentric model of the universe.The concept was introduced by Ptolemy to account for the apparent daily motion of the heavens around the Earth, producing the east-to-west rising and setting of the sun and stars, and reached Western Europe via Avicenna.

[Greta]

Primum Mobile, derived from Latin words meaning first moved, is an ancient philosophical concept that refers to the first cause or initial force driving all motion or change in the universe. In medieval and Renaissance astronomy, it was the outermost moving sphere in geocentric cosmology, believed to set all other spheres in motion. Primum Mobile is often associated with the idea of a divine or supreme mover in theological contexts.