WordReference Random House Unabridged Dictionary of American English © 2015
quad•rat•ic  (kwo dratik), 
  1. Mathematicssquare.
  2. Mathematics[Algebra.]involving the square and no higher power of the unknown quantity;
    of the second degree.

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

    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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