therewith
adverb/ˌðeəˈwɪð/, /ˌðeəˈwɪθ/
/ˌðerˈwɪð/, /ˌðerˈwɪθ/
(old use or formal)- with or in the thing mentioned
- soon or immediately after that
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therewith
Definition of therewith adverb from the Oxford Advanced Learner's Dictionary