From Longman Dictionary of Contemporary Englishquadratic equationquad‧rat‧ic e‧qua‧tion /kwɒˌdrætɪk ɪˈkweɪʒən $ kwɑː-/ noun [countable] technicalHM an equation such ax²+by+c = z, which includes numbers or quantities multiplied by themselves
Examples from the Corpus
quadratic equation• One boy was solving a quadratic equation, another was engaged with Euclid.Origin quadratic equation (1600-1700) quadratic from quadrate “square” ((14-21 centuries)), from Latin quadratus, past participle of quadrare “to make square” 