In mathematicslang=en terms the difference between magnitude and lightlike
is that
magnitude is (mathematics) of a vector, the norm, most commonly, the twonorm while
lightlike is (mathematics) (
of a fourvector ) having a space component whose magnitude is equal to its time component multiplied by the speed of light.
As a noun magnitude
is (uncountablecountable) the absolute or relative size, extent or importance of something.
As an adjective lightlike is
(mathematics) (
of a fourvector ) 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 twonorm.
(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

lightlike English
Adjective
( en adjective)
(mathematics) (of a fourvector ) having a space component whose magnitude is equal to its time component multiplied by the speed of light
See also
* spacelike
* timelike 