Definition of thereby adverb from the Oxford Advanced Learner's Dictionary

  

thereby

 adverb
adverb
BrE BrE//ˌðeəˈbaɪ//
 
; NAmE NAmE//ˌðerˈbaɪ//
 
(formal)
 
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used to introduce the result of the action or situation mentioned Regular exercise strengthens the heart, thereby reducing the risk of heart attack.
See the Oxford Advanced American Dictionary entry: thereby