Dictionary.com
definitions
  • synonyms

rule of three

See more synonyms for rule of three on Thesaurus.com
noun Mathematics.
  1. the method of finding the fourth term in a proportion when three terms are given.
Show More

Origin of rule of three

First recorded in 1585–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for rule of three

Historical Examples


British Dictionary definitions for rule of three

rule of three

noun
  1. a mathematical rule asserting that the value of one unknown quantity in a proportion is found by multiplying the denominator of each ratio by the numerator of the other
Show More
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012