Definition:Matrix Entrywise Addition/Also known as

Matrix Entrywise Addition: Also known as
The operation of matrix entrywise addition is usually referred to as just matrix addition.

Similarly, the matrix entrywise sum is likewise usually just called the matrix sum.

However, it needs to be made clear that there are a number of different operations on matrices which are also referred to as matrix addition, so there are contexts in which it is wise to make clear which is meant.