Etymology
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presupposition (n.)

1530s, "surmise, conjecture, supposition antecedent to knowledge," from French présupposition and directly from Medieval Latin praesuppositionem (nominative praesuppositio), noun of action from past-participle stem of Latin praesupponere, from prae "before" (see pre-) + suppositio (see suppose). Meaning "postulation as of an antecedent condition," hence "a prerequisite" is from 1570s.

updated on October 28, 2020

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Definitions of presupposition from WordNet

presupposition (n.)
the act of presupposing; a supposition made prior to having knowledge (as for the purpose of argument);
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.