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An informal fallacy whereby a concept is explained in terms of the concept itself, recursively.
Definition source: English Wiktionary via Wiktextract
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Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: argument
In reference to a fallacy of this kind relating to the theory of vision. If one explains that light forms an image on the retinas and something in the brain observes these images, then the same question arises: how does this observation occur?