Definition of "equation" in English

noun

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. (mathematics) 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. (astronomy) A small correction to observed values to remove the effects of systematic errors in an observation.