I've witnessed misunderstandings arise from a particular problem far too often as of late, so I propose the following Godwin-esque law within FES.
Dick's Law: As an argument continues, the tendency to pick apart, question, or blindly accept dictionary definitions increases. This includes: rejecting outright an obvious and commonly-accepted definition in order to justify an idiotic statement with a much more obscure definition (that makes no contextual sense), or being purposely vague to the extent that any idiotic statement can be justified by cherry-picking definitions.
Please keep in mind:
A dictionary is a useful tool to reference. It is not an all inclusive guide to everything. ...[the] assertion that it is such an all encompassing guide is well beyond moronic.
Brevity is the purpose of a dictionary... if it was to actually explain anything, then it would be called an Encyclopedia.
How to avoid: Clarify exactly how you define potentially exploitable words as you use them, as demonstrated well in the following:
I will give you one final chance, what qualifications for animal do we not meet. I do not mean the dictionary definition of animal meaning "inhuman behavior" I mean the biological definition for animal. (lacks cell walls, etc.)