👉 Pererration is a concept in mathematics that refers to an error or mistake made during a calculation. It can be defined as any deviation from the true value of a mathematical expression, function, or other data point. In other words, it's a discrepancy between what was calculated and what actually happened. Pererrations are often used in engineering, physics, and statistics to represent deviations from expected results or to determine how much an estimate is off from its actual value.