QUADRATIC
\kwɒdɹˈatɪk], \kwɒdɹˈatɪk], \k_w_ɒ_d_ɹ_ˈa_t_ɪ_k]\
Definitions of QUADRATIC
 2006  WordNet 3.0
 2011  English Dictionary Database
 2010  New Age Dictionary Database
 1913  Webster's Revised Unabridged Dictionary
 1919  The Winston Simplified Dictionary
 1899  The american dictionary of the english language.
 1894  The Clarendon dictionary
 1919  The Concise Standard Dictionary of the English Language
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a polynomial of the second degree

an equation in which the highest power of an unknown quantity is a square
By Princeton University

a polynomial of the second degree

an equation in which the highest power of an unknown quantity is a square
By DataStellar Co., Ltd

Pertaining to terms of the second degree; as, a quadratic equation, in which the highest power of the unknown quantity is a square.
By Oddity Software

Pertaining to terms of the second degree; as, a quadratic equation, in which the highest power of the unknown quantity is a square.
By Noah Webster.

An equation in which the square, or second degree, is the highest power of an unknown quantity.

In algebra, having the square, or second degree, as the highest power of an unknown quantity; square.
By William Dodge Lewis, Edgar Arthur Singer
By Daniel Lyons
By William Hand Browne, Samuel Stehman Haldeman