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• synonyms

# equation

[ih-kwey-zhuh n, -shuh n]
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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.

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1350–1400; Middle English < Latin aequātiōn- (stem of aequātiō) an equalizing. See equate, -ion
Related formsnon·e·qua·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for equation

### Historical Examples

• #### Every time Peter came into the equation her heart arose in his defense.

Her Father's Daughter

Gene Stratton-Porter

• #### But for the other end of the equation I could speak authoritatively.

Her Father's Daughter

Gene Stratton-Porter

• #### The extension of the government reserves changed the equation.

Brand Blotters

William MacLeod Raine

• #### The equation seemed undisturbed, yet there was something wrong with it.

Eight Keys to Eden

Mark Irvin Clifton

British Dictionary definitions for equation

# equation

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 elementswhat 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. astronomy See personal equation
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

## Word Origin and History forequation

### 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

equation in Medicine

# equation

(ĭ-kwāzhən)
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, arrow, or set of opposing arrows.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

equation in Science

# equation

[ĭ-kwāzhən]
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.