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Meaning of eustasy

eu•sta•sy

Pronunciation: (y'stu-sē), [key]
— pl. -sies.
  1. any uniformly global change of sea level that may reflect a change in the quantity of water in the ocean, or a change in the shape and capacity of the ocean basins.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.