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7 dictionary results for: Equation
Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
e·qua·tion       [i-kwey-zhuhn, -shuhn] Pronunciation Key
–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.Chemistry. a symbolic representation showing the kind and amount of the starting materials and products of a reaction.
[Origin: 1350–1400; ME < L aequātiōn- (s. of aequātiō) an equalizing. See equate, -ion]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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American Heritage Dictionary - Cite This Source - Share This
e·qua·tion       (ĭ-kwā'zhən, -shən)  Pronunciation Key 
n.  
  1. The act or process of equating or of being equated.
  2. The state of being equal.
  3. Mathematics A statement asserting the equality of two expressions, usually written as a linear array of symbols that are separated into left and right sides and joined by an equal sign.
  4. Chemistry 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.
  5. A complex of variable elements or factors: "The world was full of equations . . . there must be an answer for everything, if only you knew how to set forth the questions" (Anne Tyler).

e·qua'tion·al adj., e·qua'tion·al·ly adv.
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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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WordNet - Cite This Source - Share This
equation

noun
1. a mathematical statement that two expressions are equal 
2. a state of being essentially equal or equivalent; equally balanced; "on a par with the best" [syn: equality] 
3. the act of regarding as equal 

WordNet® 3.0, © 2006 by Princeton University.
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The American Heritage Science Dictionary - Cite This Source - Share This
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.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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American Heritage New Dictionary of Cultural Literacy, Third Edition - Cite This Source - Share This
equation

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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American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

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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Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Equation

E*qua"tion\, n. [L. aequatio an equalizing: cf. F. ['e]quation equation. See Equate.]

1. A making equal; equal division; equality; equilibrium.

Again the golden day resumed its right, And ruled in just equation with the night. --Rowe.

2. (Math.) An expression of the condition of equality between two algebraic quantities or sets of quantities, the sign = being placed between them; as, a binomial equation; a quadratic equation; an algebraic equation; a transcendental equation; an exponential equation; a logarithmic equation; a differential equation, etc.

3. (Astron.) A quantity to be applied in computing the mean place or other element of a celestial body; that is, any one of the several quantities to be added to, or taken from, its position as calculated on the hypothesis of a mean uniform motion, in order to find its true position as resulting from its actual and unequal motion.

Absolute equation. See under Absolute.

Equation box, or Equational box, a system of differential gearing used in spinning machines for regulating the twist of the yarn. It resembles gearing used in equation clocks for showing apparent time.

Equation of the center (Astron.), the difference between the place of a planet as supposed to move uniformly in a circle, and its place as moving in an ellipse.

Equations of condition (Math.), equations formed for deducing the true values of certain quantities from others on which they depend, when different sets of the latter, as given by observation, would yield different values of the quantities sought, and the number of equations that may be found is greater than the number of unknown quantities.

Equation of a curve (Math.), an equation which expresses the relation between the co["o]rdinates of every point in the curve.

Equation of equinoxes (Astron.), the difference between the mean and apparent places of the equinox.

Equation of payments (Arith.), the process of finding the mean time of payment of several sums due at different times.

Equation of time (Astron.), the difference between mean and apparent time, or between the time of day indicated by the sun, and that by a perfect clock going uniformly all the year round.

Equation clock or watch, a timepiece made to exhibit the differences between mean solar and apparent solar time. --Knight.

Normal equation. See under Normal.

Personal equation (Astron.), the difference between an observed result and the true qualities or peculiarities in the observer; particularly the difference, in an average of a large number of observation, between the instant when an observer notes a phenomenon, as the transit of a star, and the assumed instant of its actual occurrence; or, relatively, the difference between these instants as noted by two observers. It is usually only a fraction of a second; -- sometimes applied loosely to differences of judgment or method occasioned by temperamental qualities of individuals.

Theory of equations (Math.), the branch of algebra that treats of the properties of a single algebraic equation of any degree containing one unknown quantity.

Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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