Definition of order of magnitude noun from the Oxford Advanced Learner's Dictionary

 

order of magnitude

 noun
noun
BrE
 
; NAmE
 
(mathematics)
 
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a level in a system of ordering things by size or amount, where each level is higher by a factor of ten The actual measurement is two orders of magnitude (= a hundred times) greater than we expected. (figurative) The problem is of the same order of magnitude for all concerned.
See the Oxford Advanced American Dictionary entry: order of magnitude