# magnitude

/ˈmæɡnəˌtud/ (US) · /mˈæɡnɪtjˌuːd/ (UK)

Source: https://englishreference.com/word/magnitude
Updated: 2026-06-19

## Senses

### 1. size or importance

noun · CEFR B2 · Formal

the great size or importance of something.

For teachers: the property of relative size or extent; often used to emphasize the seriousness or scale of a situation.

- The government did not realize the magnitude of the economic crisis until it was too late.
- The sheer magnitude of the humanitarian disaster required a coordinated international response that spanned several continents.

### 2. earthquake strength

noun · CEFR B2 · Technical

a number that shows how much energy an earthquake releases.

For teachers: a quantitative measure of the energy released by an earthquake, typically recorded on the Richter scale or moment magnitude scale.

- The earthquake had a magnitude of 7.2, causing damage to many buildings.
- Seismologists reported that the magnitude of the aftershock was significantly lower than the initial quake, though it still posed a risk to unstable structures.

### 3. brightness of a star

noun · CEFR C1 · Technical

a number that measures how bright a star or planet looks from Earth.

For teachers: a logarithmic measure of the brightness of a celestial body, where lower numbers represent greater luminosity.

- Sirius is the brightest star in the night sky and has a very low magnitude.
- The telescope is capable of detecting distant galaxies with a visual magnitude far beyond the reach of the naked eye.

### 4. mathematical value

noun · CEFR C1 · Technical

the length or size of a mathematical object, like a vector.

For teachers: the absolute value of a real number, or the length of a vector in Euclidean space.

- To find the vector's magnitude, you need to use the Pythagorean theorem.
- In physics, velocity is a vector quantity because it accounts for both the magnitude of speed and the direction of travel.

## Examples

- We did not realize the magnitude of the problem at first.
- The government struggled to respond effectively because they underestimated the magnitude of the economic crisis.
- Astronomers categorize stars by their apparent magnitude, a scale that measures brightness as seen from Earth rather than the actual physical size or total energy output of the celestial body.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.