[ 'faləsi ]
■ noun ( plural fallacies )
1》 a mistaken belief.
2》 Logic a failure in reasoning which renders an argument invalid.
Derivatives
fallacious adjective
fallaciously adverb
fallaciousness fə'leɪʃəsnɪs noun
Origin
C15 (in the sense 'deception, guile'): from L. fallacia , from fallax , fallac- 'deceiving'.