**Rule of Three** — may refer to: *Rule of three (medicine), judgement of likelihood of harm in drug trials. *Rule of three (Wiccan), a tenet of Wicca *Rule of three (mathematics), a computation method in mathematics *Rule of three (writing), a principle of writing… … Wikipedia

**Rule of three** — Rule Rule, n. [OE. reule, riule, OF. riule, reule, F. r[ e]gle, fr. L. regula a ruler, rule, model, fr. regere, rectum, to lead straight, to direct. See {Right}, a., and cf. {Regular}.] 1. That which is prescribed or laid down as a guide for… … The Collaborative International Dictionary of English

**rule of three** — n. Math. 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 … English World dictionary

**rule of three** — a rule in mathematics: the product of the means in a proportion equals the product of the extremes used for finding the fourth term of a proportion where three are given * * * Math. the method of finding the fourth term in a proportion when three … Useful english dictionary

**rule of three** — noun the method of finding the fourth term in a proportion when three terms are given; golden rule … Australian English dictionary

**rule of three** — noun a) If two ratios are equal, then the denominator of the second equals its numerator times the reciprocal of the first ratio: if then . b) A rule for clinical trials used for determining the rate of adverse side effects when no such side… … Wiktionary

**rule of three** — Math. the method of finding the fourth term in a proportion when three terms are given. [1585 95] * * * … Universalium

**rule of three** — method for calculating the numerical value of a variable dependent on three given terms … English contemporary dictionary

**Rule of Three** — noun The religious tenet held by some Wiccans stating whatever energy, positive or negative, a person puts into the world will be returned threefold. Syn: karma, golden rule … Wiktionary

**Rule of three (programming)** — Rule of three is a code Refactoring rule of thumb to decide when a replicated piece of code should be replaced by a new procedure. It states that you are allowed to copy and paste the code once, but that when the same code is replicated three… … Wikipedia