tantamount

[ tan-tuh-mount ]
/ ˈtæn təˌmaʊnt /

adjective

equivalent, as in value, force, effect, or signification: His angry speech was tantamount to a declaration of war.

Origin of tantamount

1635–45; adj. use of obsolete noun: that which amounts to as much, itself noun use of obsolete v.: to amount to as much < Anglo-French tant amunter or Italian tanto montare to amount to as much. See tanto, amount
Can be confusedparamount tantamount
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for tantamount

British Dictionary definitions for tantamount

tantamount

/ (ˈtæntəˌmaʊnt) /

adjective

(postpositive foll by to) as good (as); equivalent in effect (to)his statement was tantamount to an admission of guilt

Word Origin for tantamount

C17: basically from Anglo-French tant amunter to amount to as much, from tant so much + amunter to amount
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for tantamount

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" (from Latin tantus, from tam "so") + amonter "amount to, go up" (see amount).

Online Etymology Dictionary, © 2010 Douglas Harper