Magnitude Definition (Mathematics, Norm, Apparent) @ Weariness.net

From Latin magnitūdō (“greatness, size”).

magnitude (plural magnitudes)

The absolute or relative size, extent or importance of something.
(mathematics) A number, assigned to something, such that it may be compared to others numerically
(mathematics) Of a vector, the norm, most commonly, the two-norm.
(astronomy) The apparent brightness of a star (on a negative, logarithmic scale); apparent magnitude
(geology) A measure of the energy released by an earthquake (e.g. on the Richter scale).