Definition of post hoc, ergo propter hoc in US English:

post hoc, ergo propter hoc


  • After this, therefore resulting from it: used to indicate that a causal relationship has erroneously been assumed from a merely sequential one.

    • ‘The relevant fallacy is post hoc ergo propter hoc.’
    • ‘When I say that post hoc ergo propter hoc is my favorite fallacy, I mean two things: first, I am a nerd, and second, I love that this simple phrase diagnoses so many logical and scientific missteps.’
    • ‘The fallacy of Post Hoc Ergo Propter Hoc occurs when something is assumed to be the cause of an event merely because it happened before that event.’