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

tantamount

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