# Magnitude vs Lightlike - What's the difference?

magnitude | lightlike |

## In mathematics|lang=en terms the difference between magnitude and lightlike

is that magnitude is (mathematics) of a vector, the norm, most commonly, the two-norm while lightlike is (mathematics) (of a four-vector ) having a space component whose magnitude is equal to its time component multiplied by the speed of light.

## As a noun magnitude

is (uncountable|countable) the absolute or relative size, extent or importance of something.

## As an adjective lightlike is

(mathematics) (of a four-vector ) having a space component whose magnitude is equal to its time component multiplied by the speed of light.

# magnitude

## English

### Noun

• (uncountable, countable) The absolute or relative size, extent or importance of something.
• (countable) An order of magnitude.
• (mathematics) A number, assigned to something, such that it may be compared to others numerically
• (mathematics) Of a vector, the norm, most commonly, the two-norm.
• (astronomy) The apparent brightness of a star (on a negative, logarithmic scale); apparent magnitude
• (seismology) A measure of the energy released by an earthquake (e.g. on the Richter scale).
• #### Derived terms

* order of magnitude * absolute magnitude * apparent magnitude