👉 In mathematics, "cotemporaneous" is a term used to describe a mathematical concept or quantity that exists between two time intervals. It refers to a quantity that can be calculated from the difference of two other quantities in a particular way. The cotemporaneous relationship is often used in physics and engineering to model the behavior of systems where one variable depends on another, but only over a relatively short period of time. In this context, it represents a measure of the rate at which the dependent quantity changes