\begin{definition}[Definition:Fallacy]
A '''(logical) fallacy''' is a mistake caused by an application of an invalid argument.
'''Logical fallacies''' abound.
Most of the documented '''fallacies''' that can be found in the literature arise from linguistic imprecision or deliberately misleading statements, or both.
Frequently the commission of '''fallacies''' is as deliberate as the telling of lies.
\end{definition}