We found one dictionary that defines the word therewise:

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1. therewise: Wiktionary

Definitions from Wiktionary (therewise) ▸ adverb:  (rare, nonstandard) In that way. ▸ Words similar to therewise ▸ Usage examples for therewise ▸ Idioms related to therewise ▸ Wikipedia articles (New!) ▸ Words that often appear near therewise ▸ Rhymes of therewise ▸ Invented words related to therewise