- equivalent, as in value, force, effect, or signification: His angry speech was tantamount to a declaration of war.
Origin of tantamount
SynonymsSee more synonyms for tantamount on Thesaurus.com
Examples from the Web for tantamount
To this aide, these attacks were tantamount to “asking to intervene on the side of ISIS.”Why Rand Paul Suddenly Wants to Bomb Syria
September 12, 2014
He was given the choice of two years in prison or oestrogen injections, tantamount to chemical castration.Benedict Cumberbatch on 'The Imitation Game,' Homophobia, and How to Combat ISIS
September 8, 2014
Being shamed by her church was tantamount to losing her community and her job.Mississippi Is Hell for These Lesbians
August 8, 2014
For them the 18-day search for the Israeli teens and the manhunt for their captors was tantamount to collective punishment.There Is No Moral Equivalent to the Murder of Three Israeli Teenagers
July 2, 2014
Forcing a baby to sleep outside the ‘Family Bed’ is tantamount to neglect.From ‘Clueless’ to Clueless: Alicia Silverstone’s ‘The Kind Mama’
April 22, 2014
He did not answer her, for he could not speak at all; but his silence was tantamount to an admission.Cleo The Magnificent
He made a furious gesture, which was tantamount to sending her to the devil.His Masterpiece
It would be tantamount to acknowledging she was for sale but that he hadn't the price.The Paliser case
The average Republican regarded this message as tantamount to a declaration of war.Union and Democracy
This would not do, said the colonel; it was tantamount to insubordination.Marion's Faith.
- (postpositive foll by to) as good (as); equivalent in effect (to)his statement was tantamount to an admission of guilt
Word Origin and History for tantamount
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).