Etymology
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syllogism (n.)

late 14c., from Old French silogisme "a syllogism, scholastic argument based on a formula or proof" (13c., Modern French syllogisme), from Latin syllogismus, from Greek syllogismos "a syllogism," originally "inference, conclusion; computation, calculation," from syllogizesthai "bring together before the mind, compute, conclude," literally "think together," from assimilated form of syn- "together" (see syn-) + logizesthai "to reason, count," from logos "a reckoning, reason" (see Logos).

updated on April 19, 2017

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Definitions of syllogism from WordNet

syllogism (n.)
deductive reasoning in which a conclusion is derived from two premises;
From wordnet.princeton.edu, not affiliated with etymonline.