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[kwo-drat-ik] /kwɒˈdræt ɪk/
Algebra. involving the square and no higher power of the unknown quantity; of the second degree.
a quadratic polynomial or equation.
Origin of quadratic
First recorded in 1650-60; quadrate + -ic
Related forms
quadratically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for quadratic
Contemporary Examples
Historical Examples
  • It is right, but too lengthy to be worth as much as a quadratic.

    A Tangled Tale Lewis Carroll
  • It had never been determined if that order was quadratic, cubic or higher.

    Cube Root of Conquest Roger Phillips Graham
  • What does matter is thisI must ask you to tell me exactly why you wished me to work out that quadratic problem for you.

  • She now began to read Euclids Elements, and proceeded in algebra as far as quadratic equations.

  • Since the fraction is infinite it cannot be commensurable and therefore its value is a quadratic surd number.

  • Method: Solve for x as in terms of y, or vice versa, in the linear and substitute in the quadratic.

    A Review of Algebra Romeyn Henry Rivenburg
  • All I ask is to live simply and sensibly, but instead of that my existence is transformed into a quadratic equation.

    Mr. Prohack

    E. Arnold Bennett
  • quadratic Equation, an equation involving the square of the unknown quantity.

    The Nuttall Encyclopaedia Edited by Rev. James Wood
British Dictionary definitions for quadratic


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
of or relating to the second power
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for quadratic

1650s, "square," with -ic + obsolete quadrate "a square; a group of four things" (late 14c.), from Latin quadratum, noun use of neuter adjective quadratus "square, squared," past participle of quadrare "to square, set in order, complete" (see quadrant). Quadratic equations (1660s) so called because they involve the square of x.

Online Etymology Dictionary, © 2010 Douglas Harper
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quadratic in Science
Relating to a mathematical expression containing a term of the second degree, such as x2 + 2. ◇ A quadratic equation is an equation having the general form ax2 + bx + c = 0, where a, b, and c are constants. ◇ The quadratic formula is x = -b ± √(b2 - 4ac)/2a. It is used in algebra to calculate the roots of quadratic equations.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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