Ad nauseam
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Ad nauseam is a Latin term used to describe something that has been continuing "to the point of nausea." For example "This topic has been discussed ad nauseam": it has been discorsed extensively and everyone is tired of it.
Argumentum ad nauseam or argument from repetition or argumentum ad infinitum is a flawed argument, whereby some statement is made repeatedly (possibly by different people) until nobody cares to refute it anymore, at which point the statement is asserted to be true because it is no longer challenged. This is a form of proof by assertion.