noun
also isos·ta·cy -təsē
( -es )
Etymology: isostasy International Scientific Vocabulary is- + -stasy (from Greek -stasia ); isostacy alteration (influenced by English -cy ) of isostasy — more at -stasia
1. : the quality or state of being isostatic
2. : general equilibrium in the earth's crust maintained by a yielding flow of rock material beneath the surface under gravitative stress and by the approximate equality in mass of each unit column of the earth from the surface to a depth of about 70 miles — compare isostatic compensation