FluentPlex

equation

/ɪˈkweɪ.ʒən/ noun B2
  1. The act or process of equating two or more things, or the state of those things being equal (that is, identical). · We need to bring the balance of power into equation
  2. An assertion that two expressions are equal, expressed by writing the two expressions separated by an equal sign; in mathematical problems, equations describe various essential aspects of the problem, each of which contributes to the resolution of the problem in part.
  3. A small correction to observed values to remove the effects of systematic errors in an observation.

Plural equations

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From the library

That, she felt, would be a sweet reward indeed for all her hard work and patient grubbing among unimaginative equations and conjugations.
Anne of Green Gables, p. 271 · C1
In this case the matter was simplified by Brunton’s intelligence being quite first-rate, so that it was unnecessary to make any allowance for the personal equation, as the astronomers have dubbed it.
The Memoirs of Sherlock Holmes, p. 23 · B2
“Oh, I am aware of that,” said Madame de Villefort; “but I have a passion for the occult sciences, which speak to the imagination like poetry, and are reducible to figures, like an algebraic equation; but go on, I beg of you; what you say interests me to the greatest degree.”
The Count of Monte Cristo, p. 523 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.