tantamount

adjective

tan·​ta·​mount ˈtan-tə-ˌmau̇nt How to pronounce tantamount (audio)
Synonyms of tantamountnext
: equivalent in value, significance, or effect
a relationship tantamount to marriage

Did you know?

Although tantamount (from the Anglo-French phrase tant amunter, meaning “to amount to as much”) was used three different ways in the early 17th century—as a noun, verb, and adjective—the adjective form has since proven paramount to English users: it’s still in use while the noun and verb are obsolete. This is not to say that the adjective hasn’t experienced change over the years. While it was once acceptable to use tantamount in a variety of different sentence structures, nowadays it is almost always followed by the word to. And to use it before a noun, as in “the two old friends exchanged tantamount greetings,” would now be considered, er, tantamount to riding a penny-farthing or boneshaker onto the expressway.

Examples of tantamount in a Sentence

His statement was tantamount to an admission of guilt. They see any criticism of the President as tantamount to treason.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Passage of this resolution was tantamount to acquiescence by Congress, granting the president the authority to respond militarily by sending thousands of troops to fight in Vietnam. Richard Cherwitz, Sun Sentinel, 6 Jan. 2026 Taking part in this nefarious activity is tantamount to an armed attack, the administration says. Graeme Wood, The Atlantic, 3 Jan. 2026 Victims of Japanese aggression, especially China and the Koreas, see visits to the shrine as tantamount to a lack of remorse about Japan’s wartime past. Mari Yamaguchi, Los Angeles Times, 31 Dec. 2025 In a Christmas Eve sermon on Wednesday, the pope said refusing to help the poor and strangers was tantamount to rejecting God himself. Reuters, NBC news, 25 Dec. 2025 See All Example Sentences for tantamount

Word History

Etymology

obsolete tantamount, noun, equivalent, from Anglo-French tant amunter to amount to as much

First Known Use

1641, in the meaning defined above

Time Traveler
The first known use of tantamount was in 1641

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Cite this Entry

“Tantamount.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tantamount. Accessed 7 Jan. 2026.

Kids Definition

tantamount

adjective
tan·​ta·​mount ˈtant-ə-ˌmau̇nt How to pronounce tantamount (audio)
: equal in value, meaning, or effect

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