The term addition refers to the mathematical operation involving combining two or more numbers by adding them together. It is one of the four basic arithmetic operations, along with subtraction, multiplication and division. In its most simple form, addition involves adding a single number (the addend) to another number (the antecedent), resulting in a sum that represents the total amount of values being combined. For example, if you are adding 2 apples + 3 oranges, the result would be 5 fruits.