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presumption (n.)

mid-13c., "seizure and occupation without right," also "taking upon oneself more than is warranted," from Old French presumcion (12c., Modern French présomption) and directly from Late Latin praesumptionem (nominative praesumptio) "confidence, audacity," in classical Latin, "a taking for granted, anticipation," noun of action from past-participle stem of praesumere "to take beforehand," 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"). In English, the meaning "the taking of something for granted" is attested from c. 1300. Presumptuous preserves the older sense.

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Definitions of presumption from WordNet

presumption (n.)
an assumption that is taken for granted;
Synonyms: given / precondition
presumption (n.)
(law) an inference of the truth of a fact from other facts proved or admitted or judicially noticed;
presumption (n.)
audacious (even arrogant) behavior that you have no right to;
Synonyms: presumptuousness / effrontery / assumption
presumption (n.)
a kind of discourtesy in the form of an act of presuming;
his presumption was intolerable
From wordnet.princeton.edu