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Definition of quadratic : 1. Of or pertaining to a square, or to squares; resembling a quadrate, or square; square.
2. Pertaining to terms of the second degree; as, a quadratic equation, in which the highest power of the unknown quantity is a square.
3. Tetragonal.

Synonyms:

quadratic equation, quadratic polynomial

Usage examples:

• I should never teach him quadratic equations again. - "The Morals of Marcus Ordeyne", William J. Locke.
• The junior had long since finished algebra and was not thinking much about the other’ s apparent interest in a certain problem in quadratic equations which she pointed out on one of the papers. - "Marjorie Dean College Freshman", Pauline Lester.
• She can make me understand mathematics, which is going some, and how I am to proceed into quadratic equations without her, I cannot see. - "Vacation with the Tucker Twins", Nell Speed.