Rule of three
Three Three, n. 1. The number greater by a unit than two; three units or objects. [1913 Webster]

2. A symbol representing three units, as 3 or iii. [1913 Webster]

{Rule of three}. (Arith.) See under {Rule}, n. [1913 Webster] [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • 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 — 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

  • Rule of Three (play) — Rule of Three is a set of three one act plays by British author and playwright Agatha Christie. It was first published in 1963. The three plays are entitled The Rats , Afternoon at the Seaside , and The Patient …   Wikipedia

  • Rule of three (writing) — For other uses, see Rule of Three. The Three Bears The rule of three is a principle in writing that suggests that things that come in threes are inherently funnier, more satisfying, or more effective than other numbers of things. The… …   Wikipedia

  • Rule of Three (Wiccan) — The Rule of Three (also threefold law or law of return) is a tenet of the Neopagan religion of Wicca. It claims that whatever energy a person puts out into the world, be it positive or negative, will be returned to that person three times.… …   Wikipedia

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