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