Definition of equation in English:

equation

Syllabification: e·qua·tion
Pronunciation: /iˈkwāZHən
 
/

noun

  • 1 Mathematics A statement that the values of two mathematical expressions are equal (indicated by the sign =).
    More example sentences
    • It also contains continued fractions, quadratic equations, sums of power series and a table of sines.
    • When I pressed him to write an equation expressing the value for a, he insisted that he would need a symbol for within.
    • Now express the pattern as a mathematical equation.
    Synonyms
    mathematical problem, sum, calculation, question
  • 2The process of equating one thing with another: the equation of science with objectivity
    More example sentences
    • As relationships go, I realized this simple equation of life.
    • I feel that I have developed some sort of equation with them.
    • And can you tell us, are you concerned about second-guessing on that whole equation?
    Synonyms
    identification, association, connection, matching; equivalence, correspondence, agreement, comparison
  • 2.1 (the equation) A situation or problem in which several factors must be taken into account: money also came into the equation
    More example sentences
    • Another factor in the equation: Used equipment must compete with new equipment in the marketplace.
    • Once all that is figured out, the most confusing factor in the equation must be pondered: playing time.
    • When pressure of competition was factored into the equation, the situation changed.
    Synonyms
    situation, problem, case, question; quandary, predicament
  • 3 Chemistry A symbolic representation of the changes that occur in a chemical reaction, expressed in terms of the formulae of the molecules or other species involved.
    More example sentences
    • When hydrolysis occurs, we will write a chemical equation to describe it, and new species will be formed in solution.
    • The chemical equations for some reactions may have a lone reactant or a single product.
    • I asked as I balanced a chemical equation and answered some questions.

Phrases

equation of the first order, (second order, etc.)

Mathematics An equation involving only the first derivative, second derivative, etc..
More example sentences
  • His doctoral dissertation was on the theory of the propeller which led to his developing a theory of partial differential equations of the second order.
  • This integral was introduced in a paper on differential equations of the second order which he wrote in 1870.
  • Special attention should be drawn also to his little known pamphlet on regular point of linear differential equations of the second order used for a number of years in connection with one of his courses of lectures.

Origin

late Middle English: from Latin aequatio(n-), from aequare 'make equal' (see equate).

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verb
tease (someone) playfully