Definition of upon

Definition of upon
  1. upon Preposition Being above and in contact with another.
  2. upon Preposition Being directly supported by another.
  3. upon Preposition At a prescribed point in time.
  4. upon Adverb Being the target of an action.
  5. upon Adverb Incidental to a specified point in time or order of action; usually combined with here-, there- or where-.
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