early 15c., "a carrying or taking away," in medicine, "mechanical removal of something harmful from the body," from Latin ablationem (nominative ablatio), "a taking away," noun of action from past-participle stem of auferre "to carry away," from ab "off, away from" (see ab-) + the irregular verb ferre (past participle latum; see oblate (n.)) "to bear, carry."
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