Question

what is magnitude or definition of magnitude

Answer 1

In physics — the study of motion distance, velocity, speed and mass expressed as quantities — is divided between vectors and scalars. A one-dimensional scalar is described by its magnitude alone, while a two-dimensional vector is fully described by its magnitude and direction. Speed is the magnitude of the movement.

Answer 2

In mathematics, magnitude is the size of a mathematical object, a property which determines whether the object is larger or smaller than other objects of the same kind. More formally, an object's magnitude is the displayed result of an ordering of the class of objects to which it belongs.