noun (n)

• a degree in a continuum of size or quantity(noun.attribute)

  Example:
  An explosion of a low order of magnitude.
  

  Synonym:
  order
  

  source: wordnet30
• 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(noun.linkdef)

  Synonym:
  magnitude
  

  source: wordnet30