Here's a breakdown:

* Magnitude: Refers to the size or absolute value of a number.

* Rearrangement: Implies changing the order of the numbers.

Example:

Imagine you have the numbers: 5, 1, 9, 3, 7

Rearranging them according to magnitude in ascending order:

1, 3, 5, 7, 9

Rearranging them according to magnitude in descending order:

9, 7, 5, 3, 1

This process is also known as sorting in computer science.