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English definition of “order of magnitude”

order of magnitude

noun [C usually singular] uk   us  
the approximate size of something, especially a number: The country's debt this year will be of the same order of magnitude as it was last year.General words for size and amount specialized mathematics a level in a system used for measuring something in which each level is ten times larger than the one before: These processor speeds have recently increased by two orders of magnitude (= by a hundred times).
(Definition of order of magnitude from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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