1. A deep opening made by disruption, as a breach in the earth or a rock; a yawning abyss; a cleft; a fissure.
That deep, romantic chasm which slanted down the green hill. --Coleridge.
2. A void space; a gap or break, as in ranks of men.
Memory . . . fills up the chasms of thought. --Addison.
n : a deep opening in the earth's surface