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Tantamount
Tantamount Tan"ta*mount`, a. [F. tant so much (L. tantus) + E.
amount.]
Equivalent in value, signification, or effect.
A usage nearly tantamount to constitutional right.
--Hallam.
The certainty that delay, under these circumstances,
was tantamount to ruin. --De Quincey.
Tantamount
Tantamount Tan"ta*mount`, v. i.
To be tantamount or equivalent; to amount. [Obs.] --Jer.
Taylor.
Meaning of Tantamount from wikipedia