Top Definition
A fundamental concept of Bistromathematics, as described in Hitchhikers Guide to the Galaxy, "a number whose existence can only be defined as being anything other than itself". Similar to, and easily confused with the related principle by which knowing that the answer is 42 precludes knowing the question.
42 is not a recipriversexcluson, because it really is the location of Stavromula Beta. What is precluded about 42 is knowing that Stavromula Beta is the question.

Yes, I am allowed to say so. In fact it's a necessity, because every publication of Hitchhiker is required, by yet another similarly related principle, to contradict all previous publications of it.
by Downstrike May 09, 2007

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