upon

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

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.