不确定度是表征合理地赋予被测量之值的分散性的参数，与测量结果一起使用，以说明测得值所处区间。
Uncertainty of measurement is a parameter associated with the result of a measurement that characterizes the dispersion of the values that could reasonably be attributed to the measurand , and describes the zone that measurement results locate in .
被测量之值