In mathematics, the term quadratic describes something that pertains to squares, to the operation of squaring, to terms of the second degree, or equations or formulas that involve such terms. Quadratus is Latin for square.

## Mathematics

### Algebra (elementary and abstract)

• Quadratic function (or quadratic polynomial), a polynomial function that contains terms of at most second degree
• Quadratic equation, a polynomial equation of degree 2 (reducible to 0 = ax2 + bx + c)
• Quadratic formula, calculation to solve a quadratic equation for the independent variable (x)
• Quadratic field, an algebraic number field of degree two over the field of rational numbers
• Quadratic irrational or "quadratic surd", an irrational number that is a root of a quadratic polynomial

## Computer science

• Quadratic probing, a scheme in computer programming for resolving collisions in hash tables
• Quadratic classifier, used in machine learning to separate measurements of two or more classes of objects