Tantamount
Tantamount , adjective
[French tant so much (Latin tantus) + English amount.]
Equivalent in value, signification, or effect.
A usage nearly tantamount to constitutional right.
The certainty that delay, under these circumstances, was tantamount to ruin.
Tantamount , intransitive verb
To be tantamount or equivalent; to amount. [Obsolete] — Jer. Taylor