A chasm or fissure.
The Grand Canyon is a rift in the Earth's surface, but is smaller than some of the undersea ones.
A lack of cohesion; a state of conflict, incompatibility, or emotional distance.
My marriage is in trouble: the fight created a rift between us and we can't reconnect.
A break in the clouds, fog, mist etc., which allows light through.
I have but one rift in the darkness, that is that I have injured no one save myself by my folly, and that the extent of that folly you will never learn.
From Middle English rift, of North Germanic origin; akin to Danish rift, Norwegian Bokmål rift (“breach”), Old Norse rífa (“to tear”). More at rive.
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The mightie trunck halfe rent, with ragged rift Doth roll adowne the rocks, and fall with fearefull drift.