### Definition of Rule of three

1. Proper noun. (religion Wicca) The religious tenet held by some Wiccans stating whatever energy, positive or negative, a person puts into the world will be returned threefold. ¹

2. Proper noun. (mathematics education) If two ratios are equal, then the denominator of the second equals its numerator times the reciprocal of the first ratio: if $\frac ab=\frac cd$ then $d=\frac\left\{bc\right\}a$. ¹

3. Proper 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. ¹

4. Proper noun. (writing rhetoric) 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. ¹

5. Proper noun. (religion Wicca) A religious tenet stating that whatever energy a person puts out into the world, be it positive or negative, will be returned to that person three times. ¹

¹ Source: wiktionary.com

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### Lexicographical Neighbors of Rule Of Three

 RugerRugglesRuhemann's purpleRuhmkorff coilRuhmkorff coilsRuhnuRuholla KhomeiniRuhrRuhr AreaRuhr River Ruhr ValleyRuinismRukigaRule 63Rule of ThreeRumaniaRumanianRumaniansRumanshRumelia RumelianRumeliansRumexRumex acetosaRumex acetosellaRumex obtusifoliusRumex scutatusRumohra