Meaning of cosmological principle

cosmolog'ical prin"ciple

Pronunciation: [key]
— Astron. Astron.
  1. the hypothesis that the universe is isotropic and homogeneous on a large scale: used to simplify the equations of general relativity for models of the universe.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.