Epeirogenic movement refers to broad, relatively slow, vertical movements of the Earth’s crust that result in the formation of large-scale features such as plateaus, basins, and continental interiors. Unlike orogenic movements, which are associated with mountain building, epeirogenic movements are typically not associated with significant folding or faulting.
Reference: Levandowski, W., & Jones, C. H. (2015). “Epeirogeny or Eustasy? Gauging Sea Level with Paleozoic Epeirogeny in the Central United States.” Geology, 43(2), 171-174.