conjunction fallacy

noun

The contradictory statement that the conjunction of two possibilities is more probable than one or both of those possibilities independently.

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Meanings

nounconjunction fallacy (uncountable)
  1. uncountableThe contradictory statement that the conjunction of two possibilities is more probable than one or both of those possibilities independently.

    Could the conjunction fallacy rest on students interpreting the experimental instructions in an unexpected way - misunderstanding, perhaps, what is meant by "probable"?

    2007 September 19, Eliezer Yudkowsky, “Conjunction Fallacy”, in LessWrong, archived from the original on 03 Feb 2026
Cite this entry
APA

conjunction fallacy. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/conjunction%20fallacy

MLA

“conjunction fallacy.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/conjunction%20fallacy. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “conjunction fallacy,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/conjunction%20fallacy.

Source: conjunction fallacy on Wiktionary, CC BY-SA 4.0.