- (a.) Fraudulently substituted for something else; not being what is purports to be; not genuine; spurious; counterfeit; as, a supposititious child; a supposititious writing.
- (a.) Suppositional; hypothetical.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). supposititious. Retrieved September 22, 2026, from http://smartdefine.org/supposititious/definitions/2068847 |
| Chicago | Webster's. 2011. "supposititious" http://smartdefine.org/supposititious/definitions/2068847 (accessed September 22, 2026). |
| Harvard | Webster's 2011, supposititious, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/supposititious/definitions/2068847>. |
| MLA | Webster's. "supposititious" 28 May 2011. Web. 22 September 2026. <http://smartdefine.org/supposititious/definitions/2068847> |