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tantamount (adj.)

1640s, from verbal phrase tant amount "be equivalent" (1620s), from Anglo-French tant amunter "amount to as much" (late 13c.), from Old French tant "as much" (11c., from Latin tantus, from tam "so;" see tandem) + amonter "amount to, go up" (see amount (v.)).

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Definitions of tantamount from WordNet

tantamount (adj.)
being essentially equal to something;
his statement was tantamount to an admission of guilt
Synonyms: equivalent
From wordnet.princeton.edu