Definition: Additive, also known as addition or summation, is a mathematical operation that adds up or totals numbers in a series. It involves adding together different quantities of the same type, such as two or more numbers, to get the total sum. In simple terms, "additory" means combining something with itself or another thing so it can be added together. For example, you could add 2 and 3 because 2 + 2 = 4 and 3 + 3 = 6. In algebraic terms, it is represented by the symbol "+" in order to denote addition. The word "additory" is often used when talking about the process of adding numbers together or combining them with another quantity. It can also refer to the act of adding up or totaling a set of things, such as adding 5 apples and then 4 more apples (5 + 4 = 9). In mathematical notation, "additory" is often used in equations where the unknowns are added together or the variables are multiplied by one another. For example: ``` Let x be a positive integer. x + (x - 2) = 13 ``` This equation represents the sum of an unknown variable and its negation, which combined would equal 13.

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