AVERAGE definition: 1. the result you get by adding two or more amounts together and dividing the total by the number…. Learn more. The most commonly used definition of the average is the arithmetic mean, [4] also known as arithmetic average i.e. the sum divided by the count, so the average of the list of numbers [2, 3, 4, 7, 9] is generally considered to be (2+3+4+7+9)/5 = 25/5 = 5. Average, which is the arithmetic mean, and is calculated by adding a group of numbers and then dividing by the count of those numbers. For example, the average of 2, 3, 3, 5, 7, and 10 is 30 divided by 6, which is 5. Free calculator to determine the average, or the arithmetic mean, of a given data set. It also returns the calculation steps, sum, count, and more. The average of a data set is the sum of its values divided by the number of values — the arithmetic mean. The average can be a value that doesn't appear in the data, and it uses every value, so outliers pull it. The simple definition of AVERAGE is a number that is calculated by adding quantities together and then dividing the total by the number of quantities. The meaning of AVERAGE is a single value (such as a mean, mode, or median) that summarizes or represents the general significance of a set of unequal values. How to use average in a sentence.