Meaning of primum mobile*

pri•mum mo•bi•le

Pronunciation: (prē'moom mō'bi-le" Eng. prī'm&schwam mob'&schwa-lē", prē'-), [key]
— Latin. Latin.
  1. (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.
  2. See
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.