Definition of whereby adverb from the Oxford Advanced American Dictionary

  

whereby

 adverb
adverb
NAmE//wɛrˈbaɪ//
 
, NAmE//ˈwɛrbaɪ//
 
(formal)
 
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by which; because of which They have introduced a new system whereby all employees must undergo regular training.
See the Oxford Advanced Learner's Dictionary entry: whereby