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Order of magnitude

noun

Noun

1
The class of scale or magnitude of any amount, where each class contains values of a fixed ratio (most often 10) to the class preceding it.
"2011, Enrico Fermi, Wikisource (translator), Concerning a Contradiction between the Electrodynamic and Relativistic Theory of Electromagnetic Mass, 1922, Enrico Fermi, Über einen Widerspruch zwischen der elektrodynamischen und relativistischen Theorie der elektromagnetischen Masse, Physikalische Zeitschrift, v 23, pp 340-344, However, we notice that although this contraction is of order of magnitude v²:c², it changes the most important terms of electromagnetic mass, i.e, the rest mass."
2
a degree in a continuum of size or quantity wordnet
3
a number assigned to the ratio of two quantities; two quantities are of the same order of magnitude if one is less than 10 times as large as the other; the number of magnitudes that the quantities differ is specified to within a power of 10 wordnet

18th century, in the sense "magnitude (brightness class) of a star", informed by the Greek τῶν μεγάλων τάξις (tôn megálōn táxis) (Ptolemy).

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