[pree-moo m moh-bi-le; English prahy-muh m mob-uh-lee, pree-]
- (in Ptolemaic astronomy) the outermost of the 10 concentric spheres of the universe, making a complete revolution every 24 hours and causing all the others to do likewise.
- prime mover.
Origin of primum mobile
literally, first moving (thing)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a prime mover
- astronomy the outermost empty sphere in the Ptolemaic system that was thought to revolve around the earth from east to west in 24 hours carrying with it the inner spheres of the planets, sun, moon, and fixed stars
C15: from Medieval Latin: first moving (thing)
Word Origin and History for primum mobile
Online Etymology Dictionary, © 2010 Douglas Harper