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rhetoric

The Enthymeme

ἐνθύμημα

The orator's everyday weapon — a syllogism that wins assent by leaving one obvious premise unspoken for the audience to supply.

The enthymeme is a compressed form of logical argument developed by Aristotle and central to his theory of rhetoric. Unlike a formal syllogism, which states all premises explicitly, an enthymeme leaves one premise unstated, relying on the audience to supply it themselves. This makes it the natural tool of public persuasion: orators deploy enthymemes because audiences find arguments more convincing when they participate in completing the reasoning, and because full syllogistic formality would bore or confuse listeners in real-world settings.

The enthymeme's power lies in this partnership between speaker and listener. When an orator argues "Socrates is a man; therefore he is mortal," the audience automatically fills in the missing universal premise—"all men are mortal"—without being told. This active mental participation makes the conclusion feel like shared discovery rather than external imposition, making it Aristotle's preferred proof for deliberative and judicial oratory. The enthymeme thus transforms logic into persuasion by turning syllogisms inside out.

Where this idea shows up

17 Greek sources

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