Definition of tantamount adjective from the Oxford Advanced American Dictionary

 

tantamount

 adjective
adjective
NAmE//ˈtæntəˌmaʊnt//
 
tantamount to something(formal)
 
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having the same bad effect as something else If he resigned it would be tantamount to admitting that he was guilty.
See the Oxford Advanced Learner's Dictionary entry: tantamount