Longman Dictionary of Contemporary English homepage

order of magnitude

 noun
     
order of magnitude plural orders of magnitude [countable]
1 if something is an order of magnitude greater or smaller than something else, it is ten times greater or smaller in size or amount
2 the scale of the size of something:
That was a problem but this crisis is of a different order of magnitude.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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