Definition of whomsoever pronoun from the Oxford Advanced Learner's Dictionary

 

whomsoever

 pronoun
pronoun
BrE BrE//ˌhuːmsəʊˈevə(r)//
 
; NAmE NAmE//ˌhuːmsoʊˈevər//
 
(literary)
 
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used instead of ‘whoever’ as the object of a verb or preposition