Dictionary
Words, grammatical forms and meanings linked to the ontology.
conjunction fallacy en · NOUN
Meanings
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(uncountable) The 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: