† ˈtantaˌmountinglyadv.Obsolete ‘equivalently, in effect’ (Davies).
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the world > relative properties > relationship > equality or equivalence > [adverb] > equivalently
to the (this) same1399
equivalentlya1529
valuably1627
tantamountingly1655
equipollentlya1677
convertibly1710
coextensively1843
1655 T. FullerChurch-hist. Brit.ii. 69 Did it not deserve the Stab of Excommunication, for any dissenting from her practice, tantamountingly to give her the Lie?