WordReference Random House Unabridged Dictionary of American English © 2017
quad•rat•ic  (kwo dratik),USA pronunciation adj. 
  1. Mathematicssquare.
  2. Mathematics[Algebra.]involving the square and no higher power of the unknown quantity;
    of the second degree.

  1. Mathematicsa quadratic polynomial or equation.
quad•rati•cal•ly, adv. 
  • quadrate + -ic 1650–60

Collins Concise English Dictionary © HarperCollins Publishers::

quadratic /kwɒˈdrætɪk/ n
  1. Also called: quadratic equation an equation containing one or more terms in which the variable is raised to the power of two, but no terms in which it is raised to a higher power
  1. of or relating to the second power

'quadratic' also found in these entries:

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