Definitions from Wiktionary (Rule of Three)

▸ noun:  (mathematics education) A rule stating that, if two ratios are equal, then the denominator of the second equals its numerator times the reciprocal of the first ratio: if a/b=c/d then d=(bc)/a.
▸ noun:  (medicine) A rule for clinical trials used for determining the rate of adverse side effects when no such side effects present during the course of the trial.
▸ noun:  (writing, rhetoric, comedy) A rule which states that things which come in groups of three are inherently funnier or more effective than things which come in groups of other sizes.
▸ noun:  (writing, rhetoric, comedy) Specifically, the technique of having a setup in advance, a reminder to keep it fresh in the audience's memory, and then a payoff.
▸ noun:  (religion, Wicca) A religious tenet stating that the energy a person puts out into the world, positive or negative, will be returned to that person threefold.
▸ noun:  (programming) A rule of thumb in the C++ programming language, stating that any class that defines a destructor, a copy constructor, or a copy assignment operator should define all three of them.
▸ noun:  (religion, Wicca) A religious tenet held by some Wiccans, stating that whatever energy, positive or negative, a person puts into the world will be returned threefold.



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