On
On adverb - Toward a point ahead in space or time.
Thereupon
Cite this Source
Thereupon and On. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/on/thereupon
On & Thereupon. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/on/thereupon>.
Thereupon or On. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/on/thereupon.
Google Ngram Viewer shows how "on" and "thereupon" have occurred on timeline