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equation

[ih-kwey-zhuh n, -shuh n] /ɪˈkweɪ ʒən, -ʃən/
noun
1.
the act of equating or making equal; equalization:
the symbolic equation of darkness with death.
2.
equally balanced state; equilibrium.
3.
Mathematics. an expression or a proposition, often algebraic, asserting the equality of two quantities.
4.
Also called chemical equation. Chemistry. a symbolic representation showing the kind and amount of the starting materials and products of a reaction.
Origin
1350-1400
1350-1400; Middle English < Latin aequātiōn- (stem of aequātiō) an equalizing. See equate, -ion
Related forms
nonequation, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for equations
  • The former first taught the method of expressing curves by equations.
  • The time machine is a computer model of the atmosphere, built not from air and water vapor but from data and equations.
  • Here's a tale of two equations that represent human exchange.
  • His office was cluttered with textbooks and academic journals, and on one wall there was a whiteboard covered with equations.
  • In the world of terrorism studies, the rhetoric of righteousness gives way to equilibrium equations.
  • In pursuit of it, he conducted elaborate experiments in the science of tea-making, deriving equations for brewing the perfect cup.
  • He went to see his high-school science teacher, and covered the blackboard with drawings and equations.
  • But there is nothing about actually being able to model a system by its equations, or solve it using mathematical techniques.
  • And remember not to define the parameters of any equations you use.
  • He counted off for grammatical and spelling errors on an engineering test that was mostly equations and calculations.
British Dictionary definitions for equations

equation

/ɪˈkweɪʒən; -ʃən/
noun
1.
a mathematical statement that two expressions are equal: it is either an identity in which the variables can assume any value, or a conditional equation in which the variables have only certain values (roots)
2.
the act of regarding as equal; equating
3.
the act of making equal or balanced; equalization
4.
a situation, esp one regarded as having a number of conflicting elements: what you want doesn't come into the equation
5.
the state of being equal, equivalent, or equally balanced
6.
a situation or problem in which a number of factors need to be considered
8.
(astronomy) See personal equation
Derived Forms
equational, adjective
equationally, adverb
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
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Word Origin and History for equations

equation

n.

late 14c., a term in astrology; meaning "action of making equal" is from 1650s; mathematical sense is from 1560s, on notion of equalizing the expressions; from Latin aequationem (nominative aequatio) "an equal distribution, community," from past participle stem of aequare (see equal (adj.)). Chemistry sense is from 1807.

Online Etymology Dictionary, © 2010 Douglas Harper
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equations in Medicine

equation e·qua·tion (ĭ-kwā'zhən, -shən)
n.

  1. A statement asserting the equality of two mathematical expressions, usually written as a linear array of symbols that are separated into left and right sides and are joined by an equal sign.

  2. A representation of a chemical reaction, usually written as a linear array in which the symbols and quantities of the reactants are separated from those of the products by an equal sign, an arrow, or a set of opposing arrows.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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equations in Science
equation
  (ĭ-kwā'zhən)   
  1. Mathematics A written statement indicating the equality of two expressions. It consists of a sequence of symbols that is split into left and right sides joined by an equal sign. For example, 2 + 3 + 5 = 10 is an equation.

  2. Chemistry A written representation of a chemical reaction, in which the symbols and amounts of the reactants are separated from those of the products by an equal sign, arrow, or a set of opposing arrows. For example, Ca(OH)2 + H2SO4 = CaSO4 + 2H2O, is an equation.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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equations in Culture

equation definition


An expression of equality between two formulas in mathematics. The two formulas are written with an equal sign between them: 2 + 2 = 4 is an equation, as is E = mc2.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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