Definition of tantamount adjective from the Oxford Advanced Learner's Dictionary

 

tantamount

 adjective
adjective
BrE BrE//ˈtæntəmaʊnt//
 
; NAmE NAmE//ˈtæntəmaʊnt//
 
 
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tantamount to something (formal) having the same bad effect as something else If he resigned it would be tantamount to admitting that he was guilty. Word Origin mid 17th cent.: from the earlier verb tantamount ‘amount to as much’, from Italian tanto montare.
See the Oxford Advanced American Dictionary entry: tantamount