Definition:Magic Square

Definition
A magic square is an arrangement of $n^2$ numbers into an $n \times n$ square array such that:
 * the sum of the elements of each row
 * the sum of the elements in each column
 * the sum of the elements along each diagonal

are the same.

When the elements are not specified, it is conventional for them to be the first $n^2$ (strictly) positive integers.

Also see

 * Definition:Multiplicative Magic Square