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

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