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Wordnet 3.0

ADVERB (1)

1. immediately after this;
- Example: "hereupon, the passengers stumbled aboard"



The Collaborative International Dictionary of English v.0.48:

Hereupon \Here`up*on"\, adv.
   On this; hereon.
   [1913 Webster]


WordNet (r) 3.0 (2006):

hereupon
    adv 1: immediately after this; "hereupon, the passengers
           stumbled aboard"