Phrase guide

order of magnitude

noun · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Southern-England: Recorded audio is listed in the source snapshot.

1

noun

Meaning 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.

Definition source: English Wiktionary via Wiktextract

Topics: mathematics, sciences

Examples

  • 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.

Meaning relationships

Synonyms: OOM

Antonyms: none provided

Broader terms: order, scale

2

noun

Meaning 2

a degree in a continuum of size or quantity

Definition source: Princeton WordNet 3.0

Examples

  • it was on the order of a mile
  • an explosion of a low order of magnitude

Meaning relationships

Synonyms: order

Antonyms: none provided

Broader terms: magnitude

3

noun

Meaning 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

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: magnitude

Antonyms: none provided

Broader terms: ratio

History

Etymology

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

Across languages

Translations

24 source translations are retained for this English entry.

  • Catalan: ordre de magnitud — class of scale
  • Chinese Mandarin: 數量級 /数量级 (shùliàngjí) — class of scale
  • Dutch: orde van grootte — class of scale
  • Estonian: suurusjärk — class of scale
  • Finnish: suuruusluokka — class of scale
  • Finnish: kertaluokka — class of scale
  • French: ordre de grandeur — class of scale
  • German: Größenordnung — class of scale
  • Hebrew: סֵדֶר גֹּדֶל (séder gódel) — class of scale
  • Hungarian: nagyságrend — class of scale
  • Irish: ord méadaíochta — class of scale
  • Japanese: 桁 (keta) — class of scale
  • Kazakh: реттік шама (rettık şama) — class of scale
  • Korean: 크기 정도 (keugi jeongdo) — class of scale
  • Korean: 크기 자릿수 (keugi jaritsu) — class of scale
  • Norwegian Bokmål: størrelsesorden — class of scale
  • Polish: rząd wielkości — class of scale
  • Portuguese: ordem de grandeza — class of scale
  • Spanish: orden de magnitud — class of scale
  • Swedish: storleksordning — class of scale
  • Thai: อันดับของขนาด — class of scale
  • Turkish: büyüklük mertebesi — class of scale
  • Ukrainian: порядок величини (porjadok velyčyny) — class of scale
  • Vietnamese: bậc độ lớn — class of scale