Meaning of “order of magnitude” in the English Dictionary

british dictionary

"order of magnitude" in British English

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order of magnitudenoun [ C usually singular ]

uk /ˌɔː.dər əv ˈmæɡ.nɪ.tjuːd/ us /ˌɔːr.dɚ əv ˈmæɡ.nɪ.tuːd/

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.

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)