What is magniutude?

Answer 1

Magnitude is a quantity without direction, a.k.a. a "scalar" value. An example is speed ("30 miles per hour"), which is the magnitude of velocity ("30 miles per hour in the Western direction")

Answer 2

Magnitude refers to the size or extent of something, often quantified using a numerical scale. It can refer to physical properties such as the brightness of a star or the intensity of an earthquake, as well as more abstract concepts like the significance of an event.