Prior to
Prior to preposition - Earlier than.
Upon and prior to are semantically related. in indicating position topic. In some cases you can use "Upon" instead a preposition phrase "Prior to".
Upon
Upon preposition - In or into contact with.
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Synonyms for Upon
Prior to and upon are semantically related. Sometimes you can use "Prior to" instead a preposition "Upon".
Mutual synonyms
Both terms in one sentence
-
Popplio had similar reactions upon their reveal prior to the release of Pokémon Sun and Moon.
Source: Memetic Loser - Similar to the Special stat, prior to Generation IV the stats a move's damage depended upon (Attack and Defense or Special Attack and Special Defense) was based on the move type.
- Tony Stark does this just prior to unleashing the Mark I armour upon his captors in Iron Man.
Source: Fist of Rage
Cite this Source
Upon and Prior to. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/prior_to/upon
Prior to & Upon. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/prior_to/upon>.
Upon or Prior to. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/prior_to/upon.
Google Ngram Viewer shows how "prior to" and "upon" have occurred on timeline