Definition of "upon"
preposition:
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Being above and in contact with another.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Being directly supported by another.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
At a prescribed point in time.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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adverb:
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Being the target of an action.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Incidental to a specified point in time or order of action; usually combined with here-, there- or where-.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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