involving an unknown quantity that is multiplied by itself once only 平方的;二次方的 a quadratic equation 二次方程式
Oxford Collocations DictionaryQuadratic is used with these nouns:- equation
Word Originmid 17th cent.: from French quadratique or modern Latin quadraticus, from quadratus ‘made square’, past participle of quadrare, from quattuor ‘four’.