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dialetheism.

The theory that statements can be both true and false at the same time and in the same sense. The opposite of the law of noncontradiction.

11 characters3 syllables approx.English language

Meaning & usage

noun/ˌdaɪ.əˈlɛθ.i.ɪz.əm/US
  1. The theory that statements can be both true and false at the same time and in the same sense. The opposite of the law of noncontradiction.

    uncountable · usually
Where this word comes from

Coined by Graham Priest and Richard Routley, from di- + Ancient Greek ἀλήθεια (alḗtheia, “truth”), in 1981.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.