Definition of "magnitude" in English

noun

1. (uncountable, countable) The absolute or relative size, extent or importance of something.

2. (countable) An order of magnitude.

3. (mathematics) A number, assigned to something, such that it may be compared to others numerically

4. (mathematics) Of a vector, the norm, most commonly, the two-norm.

5. (astronomy) A logarithmic scale of brightness defined so that a difference of 5 magnitudes is a factor of 100.

6. (seismology) A measure of the energy released by an earthquake (e.g. on the Richter scale).