Pronunciation: (ik-spans'), [key]
1. an uninterrupted space or area; a wide extent of anything: an expanse of water.
2. something that is spread out, esp. over a relatively large area: that great expanse, the sky.
3. expansion; extension: the wide expanse of scientific knowledge.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.