stillstand noun 3verb 1forms 3 noun3 •A period of time during which the terminus of a glacier remains stationary. •A period of geologic time during which eustatic sea level stays apparently constant, relative to adjacent periods of geologic time, neither characterized by transgression, nor regression. •(no longer used) A standstill. verb1 •To cease in either glacial advance or retreat.The base of the stratigraphic successions consists of outwash fan deposits emplaced in the early deglaciation when ice margin stillstanded immediately beyond the depositional area. — 2016 formsstillstanded · stillstanding · stillstands