(prep.) On; -- used in all the senses of that word, with which it is interchangeable.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). upon. Retrieved September 20, 2026, from http://smartdefine.org/upon/definitions/2078105 |
| Chicago | Webster's. 2011. "upon" http://smartdefine.org/upon/definitions/2078105 (accessed September 20, 2026). |
| Harvard | Webster's 2011, upon, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/upon/definitions/2078105>. |
| MLA | Webster's. "upon" 28 May 2011. Web. 20 September 2026. <http://smartdefine.org/upon/definitions/2078105> |