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upon

up·on [ ə pón ] CORE MEANING: means the same as "on," but is more formal
He stretched out his legs upon the sofa.
She climbed upon her father's knee.


preposition 
Definition:
 
1. on surface: on or onto the surface of something ( formal )
The great beast bounced to a halt upon the parapet.

2. one after another: used between two occurrences of the same noun to indicate a large amount or number of that noun
They claimed that the report contained "innuendo upon innuendo."

3. followed by: used to indicate that one event is followed immediately by another event
Upon finding the relevant text, they stored it in their own electronic files.

4. about to happen: used to indicate that an event is imminent
The holidays are upon us again.

[12th century. <up + on; after Old Norse upp á]
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