Pronunciation: (kaz'um), [key]
1. a yawning fissure or deep cleft in the earth's surface; gorge.
2. a breach or wide fissure in a wall or other structure.
3. a marked interruption of continuity; gap: a chasm in time.
4. a sundering breach in relations, as a divergence of opinions, beliefs, etc., between persons or groups.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.