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Synonyms
tan·ta·mount (tăńtə-mount́)

[From obsolete tantamount, an equivalent, from Anglo-Norman tant amunter, to amount to as much, tant, so much, so great (from Latin tantum neuter of tantus) (from tam, so; see to-), + amunter, to amount to, variant of Old French amonter; see amount.]

adjective 

Equivalent in effect or value: a request tantamount to a demand.