Pronunciation: (yOO'stu-sē), [key]
—pl. -sies. Geol.
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. Also,eu'sta•cy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.