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or eustacy

[yoo-stuh-see] /ˈyu stə si/
noun, plural eustasies. Geology
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.
Origin of eustasy
1945-50; nominalization of eustatic caused by eustasy (< German eustatisch, coined by Austrian geologist Edward Suess (1831-1914); see eu-, static), with -stasy for -stasis stasis, probably on the model of ecstasy
Related forms
[yoo-stat-ik] /yuˈstæt ɪk/ (Show IPA),
eustatically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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eustasy in Science

A uniform worldwide change in sea level caused especially by fluctuations in the amount of water taken up by continental and polar icecaps, or by a change in the capacity of ocean basins.

eustatic (y-stāt'ĭk)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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