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Conjunction: whereupon  ,weh-rú'pón
  1. Immediately after which
    "the Japanese refused to import U.S. made cellular phones whereupon the U.S. imposed strict tariffs on Japanese exports"
Adverb: whereupon  ,weh-rú'pón
  1. In consequence of which
    "this is a statement whereupon the listeners may get angry";
    - whereat