order of magnitude

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Related to Scale (order of magnitude): Moment magnitude scale

order of magnitude

[′ȯrd·ər əv ′mag·nə‚tüd]
(chemistry)

order of magnitude

A change in quantity or volume as measured by the decimal point. For example, from tens to hundreds is one order of magnitude. Tens to thousands is two orders of magnitude; tens to millions is three orders of magnitude, etc.