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Definitions

upon

[uh-pon, uh-pawn] / əˈpɒn, əˈpɔn /
PREPOSITION
at the time of
Synonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It’s the latter portion — “subject to the jurisdiction thereof” — that leaves room for interpretation, forming the beachhead upon which legal arguments against birthright citizenship have been mounted.

From Salon • Apr. 4, 2026

This master data layer, which Palantir called Ontology, became the foundation upon which all of its other applications were built.

From MarketWatch • Apr. 4, 2026

Throughout “Those Who Are About to Die,” the reader comes upon fascinating generalizations, usually introduced by attention-arousing brief sentences.

From The Wall Street Journal • Apr. 3, 2026

The clocks have gone forward, a clear signal that the business end of the football season is upon us.

From BBC • Apr. 1, 2026

Some felt comforted because something was being done to solve the problem that had come upon them so unexpectedly to spoil the calm progression of their days.

From "Rowan of Rin" by Emily Rodda