What is the definition of a sum?

The definition of a sum pertains specifically to the result obtained from an addition problem. When you add two or more numbers together, the result is referred to as the sum. For example, if you add 3 and 5, the result, which is 8, is called the sum of 3 and 5. This fundamental concept in arithmetic forms the basis for many mathematical operations and is used extensively in various mathematical contexts.

In contrast, the other options describe different arithmetic operations: division, multiplication, and subtraction, which have their respective terms for their results (quotient, product, and difference). Thus, the correct answer is that the sum represents the answer to an addition problem.