Rule Of Three Definition

noun

The method of finding the fourth term of a proportion when three terms are given: the product of the first and last terms is equal to the product of the second and third.

Webster's New World

pronoun

(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 then .

Wiktionary

(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.

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(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.

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(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.

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(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.

Wiktionary