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English definition of “quadratic equation”

quadratic equation

noun [C] uk   /kwɒdˌræt.ɪk.ɪˈkweɪ.ʒən/ us    /-ˌræt̬-/
an equation that includes an unknown value that is multiplied by itself only once, and does not include an unknown value multiplied by itself more than once: In the quadratic equation, 2y2+3y=14, y=2 or y=-3½.
(Definition of quadratic equation from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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