Definition of therewith adverb from the Oxford Advanced American Dictionary

     

    therewith

     adverb
    adverb
    NAmE//ˌðɛrˈwɪθ//
     
    , NAmE//ˌðɛrˈwɪð//
     
    (old use or formal)
     
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  1. 1with or in the thing mentioned
  2. 2soon or immediately after that
See the Oxford Advanced Learner's Dictionary entry: therewith