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(1)   The property of relative size or extent (whether large or small)
"They tried to predict the magnitude of the explosion"
"About the magnitude of a small pea"
(2)   Relative importance
"A problem of the first magnitude"
(3)   A number assigned to the ratio of two quantities; two quantities are of the same order of magnitude if one is less than 10 times as large as the other; the number of magnitudes that the quantities differ is specified to within a power of 10


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