Definition - order of magnitude

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order of magnitude
  1. 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
  2. a degree in a continuum of size or quantity; "it was on the order of a mile"; "an explosion of a low order of magnitude"