Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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upon

up·on

upon

 
 
pronunciation:
pan
part of speech: preposition
definition 1: on.
definition 2: up and on, in a high position.
The king sat upon his throne.
definition 3: in or into full contact with.
A new day is upon us.
definition 4: at the time or occasion of.
We greeted the dignitaries upon their arrival.