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Preposition: upon  u'pón
  1. In contact with, on top of
    "the book upon the table";
    - on
  2. Supported by
    "balanced upon one leg";
    - on
  3. At or following a prescribed point in time
    "The contract was rendered void upon his death";
    - on
Adjective: up on
  1. Being up to particular standard or level especially in being up to date in knowledge
    "up on the news";
    - abreast, au courant, au fait, apace [N. Amer]

See also: informed

Encyclopedia: Upon