Definition: The word "arithmet" translates to mathematical in Greek. It means 'to measure,' particularly to count, number, or value. The definition of arithmet is as follows: Mathematical calculation involving addition, subtraction, multiplication, division, etc., which involves numerical data and concepts. In this context, it refers to the process of counting things according to a mathematical formula. For example, in mathematics, you use an "arithmetical expression" to represent a mathematical relationship between two quantities such as speed, distance, or time.