# equations

## 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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To equations
Collins
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
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
Cite This Source
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
Cite This Source
American Heritage
Science Dictionary
 equation   (ĭ-kwā'zhən)  Pronunciation Key  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. 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
Cite This Source
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
Cite This Source
Example sentences
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.
Nearby Words
Synonyms