Definition:Mean


 * Arithmetic mean, also known as the common mean


 * Geometric mean


 * Harmonic mean


 * Quadratic mean

The following are hybrid concepts:


 * Weighted mean


 * Heronian mean


 * Hölder mean (also known as the power mean or generalized mean)

In geometry:


 * Golden mean

In the field of probability theory, the term is used for:


 * Expectation