Meaning of non-Euclidean

non-Eu•clid•e•an

Pronunciation: (non"y-klid'ē-un), [key]
— adj.
  1. differing from the postulates of Euclid or based upon postulates other than those of Euclid.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.