## 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.