late 14c., "to take upon oneself, to take liberty," also "to take for granted, presuppose," especially overconfidently, from Old French presumer (12c.) and directly from Latin praesumere "anticipate," in Late Latin, "assume," from prae "before" (see pre-) + sumere "to take, obtain, buy," from sus‑, variant of sub‑ "up from under" + emere "to take" (from PIE root *em- "to take, distribute"). "To presume is to base a tentative or provisional opinion on such knowledge as one has, to be held until it is modified or overthrown by further information" [Century Dictionary]. Related: Presumed; presumedly; presuming.
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