重复性是由一个评价人，采用一种测量仪器，多次测量同一零件的同一特性时获得的测量值变差。

Repeatability is the variation in measurements obtained with one measurement instrument when used several times by one appraiser while measuring the identical characteristic on the same part.

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再现性是由不同的评价人采用相同的测量仪器，测量同一零件的同一特性时测量平均值的变差。

Reproducibility is the variation in the average of the measurements made by different appraisers using the same measuring instrument when measuring the identical characteristic on the same part.

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