equation

[ih-kwey-zhuhn, -shuhn]
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; Middle English < Latin aequātiōn- (stem of aequātiō) an equalizing. See equate, -ion

nonequation, noun
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World English Dictionary
equation (ɪˈkweɪʒən, -ʃən)
 
n
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
7.  See chemical equation
8.  astronomy See personal equation
 
e'quational
 
adj
 
e'quationally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

equation
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 L. aequationem, from aequare (see equal). Chemistry sense is from 1807.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
equation   (ĭ-kwā'zhən)  Pronunciation Key 
  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.


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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

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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Example sentences
Italian mathematicians engaged in bitter feuds, challenging each other to solve
  ever more complicated equations.
And the local people are certainly left out of the equation.
In 1930, they created the concept to balance an equation that was not adding up.
That equation is patently incorrect.
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