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.
Also, eustacy.

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

eustatic [yoo-stat-ik] , adjective
eustatically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
eustatic (juːˈstætɪk)
denoting or relating to worldwide changes in sea level, caused by the melting of ice sheets, movements of the ocean floor, sedimentation, etc
[C20: from Greek, from eu- + static]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
eustasy   (y'stə-sē)  Pronunciation Key 

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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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Example sentences
Mantle viscosity, glacial isostatic adjustment and the eustatic level of the sea.
Eustatic sea level refers to the global or worldwide height of sea levels.
Further compromising marsh sustainability are the local rates of subsidence and eustatic sea level rise.
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