Definition of equation noun from the Oxford Advanced American Dictionary

      

    equation

     noun
    noun
    NAmE//ɪˈkweɪʒn//
     
     
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  1. 1[countable] (mathematics) a statement showing that two amounts or values are equal, for example 2x + y = 54
  2. 2[uncountable, singular] the act of making something equal or considering something as equal (= of equating them) The equation of wealth with happiness can be dangerous.
  3. 3[countable, usually singular] a problem or situation in which several things must be considered and dealt with When children enter the equation, further tensions may arise within a marriage.
See the Oxford Advanced Learner's Dictionary entry: equation