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Meaning of deglaciation

de•gla•ci•a•tion

Pronunciation: (dē-glā"shē-ā'shun, -sē-), [key]
— n. Geol.
  1. the gradual melting away of a glacier from the surface of a landmass.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.