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

 

overwhelmingly

 adverb
adverb
BrE BrE//ˌəʊvəˈwelmɪŋli//
 
; NAmE NAmE//ˌoʊvərˈwelmɪŋli//
 
 
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in a way that is very great or very strong; in a way that is so powerful that you cannot resist it or decide how to react They voted overwhelmingly against the proposal.