upon
/əˈpɑːn/
preposition
Britannica Dictionary definition of UPON
formal
1
:
on
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He carefully placed the vase upon the table.
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They built their city upon a cliff overlooking the sea.
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She was seated upon a throne.
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an assault upon traditional values
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She was admitted to his office immediately upon her arrival.
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That kind of behavior is frowned upon.
2
—
used to say that someone or something is very close or has arrived
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The enemy was suddenly upon us.
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The holidays are nearly upon us. [=the holidays are nearly here; the holidays have nearly begun]
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Before we knew it, the date of the wedding was upon us.
3
—
used to emphasize something that is repeated many times
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We removed layer upon layer [=many layers] of old paint from the paneling.
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She studied for hour upon hour. [=for many hours]
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thousands upon thousands of people