Define Unmoved mover.

The concept of the "Unmoved Mover" is a philosophical and theological idea, most notably associated with Aristotle's metaphysics and later adopted by thinkers such as Thomas Aquinas in medieval Christian theology. The Unmoved Mover is a prime mover or ultimate cause that initiates change and motion in the universe without itself undergoing any change.

In Aristotle's framework, the Unmoved Mover is the first cause of all movement and change in the cosmos. It is an eternal, unchanging, and purely actual being, transcending the contingent and ever-changing nature of the material world. The Unmoved Mover serves as the source of order, purpose, and teleology in the universe, setting everything in motion by virtue of its own perfection.

Thomas Aquinas incorporated this concept into his philosophical synthesis of Christian theology and Aristotelian philosophy. He identified the Unmoved Mover with the God of classical theism, asserting that God's essence is pure actuality, devoid of potentiality. As the Unmoved Mover, God is the eternal and unchanging source of all motion and existence, sustaining the created order in a state of continual dependence.

In summary, the Unmoved Mover represents a transcendent, eternal, and unchanging principle that imparts motion and order to the dynamic and contingent universe.