Pronunciation: (kaz'um),[key] —n. 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.