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[kwo-drat-ik] /kwɒˈdræt ɪk/
1.
2.
Algebra. involving the square and no higher power of the unknown quantity; of the second degree.
noun
3.
1650-1660
Related forms
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for quadratic
Contemporary Examples
• As a teen, Randy had painted a submarine, an elevator door and the quadratic equation on the walls of his childhood bedroom.

October 7, 2008
• “When I was in third grade, I was in quadratic equations when my class was, like, reading clocks,” Andraka says.

Historical Examples
• The next three propositions contain problems which may be said to be solutions of quadratic equations.

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

I. Platts
• What does matter is thisI must ask you to tell me exactly why you wished me to work out that quadratic problem for you.

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

• Another type of quadratic moment is supplied by the deviation-moments, or products of inertia of a distribution of matter.

• The quadratic moments with respect to different planes through a fixed point O are related to one another as follows.

• It is right, but too lengthy to be worth as much as a quadratic.

Lewis Carroll
• Following J. Plcker, we give an account of the lines of a quadratic complex that meet a given line.

/kwɒˈdrætɪk/
noun
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
2.
of or relating to the second power
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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   (kwŏ-drāt'ĭk)    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
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