magnitude

magnitude — noun

1. how large, serious, or important something is, especially when the scale of it m

1.nounB2
Definition

how large, serious, or important something is, especially when the scale of it matters for understanding its full effects or significance.

Example

The team did not fully understand the magnitude of the problem until the data arrived.

Residents were shocked by the magnitude of the flood damage across the whole town.

collocation: magnitude of [something]

Common collocations
  • of great magnitude
  • full magnitude
  • sheer magnitude
  • true magnitude
  • magnitude of the problem
Synonyms
  • scale

    focuses on range or level with an implicit reference standard

  • extent

    emphasises the physical or conceptual boundaries of something

  • significance

    stresses meaning or consequence rather than physical size

  • scope

    suggests the breadth of coverage or the range of items affected

Antonyms
  • insignificance

    indicates a lack of importance rather than small size

  • triviality

    suggests something so minor it is barely worth noticing

Grammar Patterns

magnitude + of + noun phrase

adjective + magnitude

Usage Note

Often used with 'of' followed by a noun phrase describing the thing being assessed. Frequently modified by adjectives such as 'full', 'true', 'sheer', or 'real' to emphasize the scale.

Common Mistakes

I did not know the magnitude how big it was.
I did not know the magnitude of the problem.
'magnitude' takes 'of' + noun, not a 'how' + adjective clause.

2. a number on a fixed scale that shows how bright a star, planet, or other object

2.nounC1
Definition

a number on a fixed scale that shows how bright a star, planet, or other object in the sky appears when seen from Earth.

Example

Astronomers measure the magnitude of stars to compare how bright they really are.

astronomy: stellar magnitude scale

The telescope revealed a galaxy with a magnitude too faint for the human eye.

Common collocations
  • apparent magnitude
  • absolute magnitude
  • visual magnitude
  • magnitude scale
Synonyms
  • brightness

    general perceptual term; magnitude is the specific numerical measure

Grammar Patterns

magnitude + of + number

adjective + magnitude

Usage Note

The astronomical magnitude scale is inverted: a lower number indicates a brighter object, and very bright objects have negative values (e.g., Sirius at −1.46). Commonly paired with 'apparent' (brightness as seen from Earth) or 'absolute' (intrinsic brightness at a standard distance).

Common Mistakes

The star has a big magnitude.' (meaning bright).
The star has a small magnitude.
In astronomy, a smaller magnitude number means a brighter star.

3. a number that describes the strength or energy released by an earthquake, measur

3.nounC1
Definition

a number that describes the strength or energy released by an earthquake, measured using a standard numerical scale.

Example

The earthquake had a magnitude of 7.2, causing major damage to the city.

seismology: earthquake magnitude scale

Scientists recorded a small magnitude 3.1 tremor near the volcano last night.

Common collocations
  • earthquake magnitude
  • magnitude scale
  • moment magnitude
  • Richter magnitude
Synonyms
  • strength

    everyday term for earthquake size; magnitude is the precise numerical measure

Grammar Patterns

magnitude + number

adjective + magnitude

magnitude + of + number

Usage Note

Each whole-number step on the scale corresponds to roughly 32 times more energy released. Typically used without an article in the pattern 'magnitude [number]' (e.g., 'a magnitude 6.2 earthquake'). Modern reports usually cite the moment magnitude scale (Mw) rather than the older Richter scale.

Common Mistakes

The earthquake measured 7 magnitude.
The earthquake measured magnitude 7.
The standard word order is 'magnitude [number]'.

Synonym discussion

Sense: noun/1

All four words relate to how big or important something is, but they highlight different aspects. Scale suggests the full range or level of something, often in comparison with a standard ('the scale of the operation was vast'). Extent focuses on the physical or conceptual boundaries of something ('the extent of the damage covered three blocks'). Significance points toward meaning or consequence rather than physical size ('the significance of the discovery was not immediately clear'). Scope describes the range of things that something covers or affects ('the scope of the project included five countries'). Magnitude is the most general of the four, covering both size and importance, and is often used when the sheer scale of something is overwhelming or surprising.

scale ↗extent ↗significance ↗scope ↗

Common collocations

Nouns

Adverbs

Phrases

  • order of magnitude
  • of the first magnitude

Prepositions

Etymology

LatinEnglish

Magnitude comes from Latin magnitūdō, meaning 'greatness' or 'largeness', formed from magnus ('great, large') plus the abstract-noun suffix -tūdō. The word entered English in the 14th century with the general meaning of 'great size'. Its use in astronomy dates from the 17th century, when early stargazers ranked stars by 'magnitudes' of brightness. The seismological sense was adopted in the 1930s after Charles Richter developed his numerical scale for measuring earthquake energy.