A
logical fallacy in which the same
word is used with multiple
meanings. If this is done
subtly, it can often
convince the
unwary.
Example: "It is too Free Software! It doesn't cost anything, so it's free!" The 'free' in "Free Software" is as in libre, while in the second sentence it is used as in gratis.
To prove the Equivocation, identify the word used and show that the definition in the first case is not appropriate for the second.