n.

1. 谬误；谬论；谬见[C]
   It's a popular fallacy that success always brings happiness.

   认为成功总是带来幸福是一种普遍的谬见。

2. 谬误的推理[C][U]
   This is a statement based on fallacy.

   这是一项基于谬误推理之声明。

n.

1. a mistaken belief.
2. Logic  a failure in reasoning which renders an argument invalid.