Synonyms of syllogism
1
: a deductive scheme of a formal argument consisting of a major and a minor premise and a conclusion (as in "every virtue is laudable; kindness is a virtue; therefore kindness is laudable")
2
: a subtle, specious, or crafty argument
3
: deductive reasoning

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For those trained in formal argument, the syllogism is a classical form of deduction, specifically an argument consisting of a major and a minor premise and a conclusion. One example is the inference that “kindness is praiseworthy” from the premises “every virtue is praiseworthy” and “kindness is a virtue.” Syllogism came to English through Anglo-French from the Latin noun syllogismus, which in turn can be traced back to the Greek verb syllogizesthai, which combines logizesthai (meaning “to calculate,” and coming from logos, meaning “word” or “reckoning”) with syl-, which comes from syn-, meaning “with” or “together.”

Examples of syllogism in a Sentence

An example of a syllogism is: “All men are human; all humans are mortal; therefore all men are mortal.”
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.
Twitter users often accept a flawed syllogism by using a conclusion as one of the premises – namely, that the platform spreads truthful information. Aaron Duncan, The Conversation, 29 Oct. 2020 And Lincoln has a famous syllogism where, If the Black man can be enslaved because his skin is darker than yours, then you can be enslaved by anyone whose skin is fairer than yours. David Frum, The Atlantic, 10 June 2026 Chairman Xi will undoubtedly want to prevent this syllogism from presenting itself to the minds of Chinese Christians. Cameron Hilditch, National Review, 1 Oct. 2020 This syllogism is embraced by many Democrats, who are determined to recapture an industrial working-class base, and many Republicans, who use it as evidence that the government has sold out American workers in the heartland. Adam S. Posen, Foreign Affairs, 20 Apr. 2021

Word History

Etymology

Middle English silogisme, from Anglo-French sillogisme, from Latin syllogismus, from Greek syllogismos, from syllogizesthai to syllogize, from syn- + logizesthai to calculate, from logos reckoning, word — more at legend

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of syllogism was in the 14th century

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Cite this Entry

“Syllogism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/syllogism. Accessed 7 Jul. 2026.

Kids Definition

: a brief form for stating an argument that consists of two statements and a conclusion that must be true if these two statements are true

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