Definition of magnitude noun from the Oxford Advanced American Dictionary



    magnitude (of something)
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  1. 1[uncountable] (formal) the great size or importance of something; the degree to which something is large or important We did not realize the magnitude of the problem. a discovery of the first magnitude
  2. 2[countable, uncountable] (astronomy) the degree to which a star is bright The star varies in brightness by about three magnitudes.
  3. 3[countable, uncountable] (geology) the size of an earthquake The quake reached a magnitude of 7.1 on the Richter scale.
See the Oxford Advanced Learner's Dictionary entry: magnitude