supposition Copy link Outline I. Something laid down as a basis of argumentII. A (mere) notion or unfounded belief • supposition: I. Something laid down as a basis of argument: expr. by pōno, făcio, fingo: on this s. (or assumption), quo posito, Cic. Fin. 3, 8, 29: v. to suppose (I.). Also putare may sometimes serve: and if this is too improbable a s. to be entertained, *quod si vel putari (animo fingi) absurdum est; quod si ne putare quidem possumus: v. to suppose (II.), fancy. II. A (mere) notion or unfounded belief: ŏpīnio: mere s.s, opinionum commenta: Cic. N. D. 2, 2, 5: v. opinion, conjecture.