from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Mathematics Of, relating to, or containing quantities of the second degree.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. square-shaped
  • adj. of a polynomial, involving the second power (square) of a variable but no higher powers, as .
  • adj. of an equation, of the form .
  • adj. of a function, of the form .
  • n. A quadratic polynomial, function or equation.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to a square, or to squares; resembling a quadrate, or square; square.
  • adj. Tetragonal.
  • adj. Pertaining to terms of the second degree.

from The Century Dictionary and Cyclopedia

  • In algebra, involving the square and no higher power of the unknown quantity or variable of the second degree; of two dimensions.
  • In crystallography, tetragonal or dimetric: applied to the system that includes the square prism and related forms. See crystallography.
  • n. In algebra, an equation in which the highest power of the unknown quantity is the second, the general form being
  • n. plural That branch of algebra which treats of quadratic equations.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a polynomial of the second degree
  • n. an equation in which the highest power of an unknown quantity is a square
  • adj. of or relating to the second power
  • adj. of or relating to or resembling a square


From quadrate.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Confer French quadratique. (Wiktionary)


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