What is repeatability in the context of measurement?

Repeatability refers specifically to the ability to obtain the same measurement results when the same measurement procedure is executed multiple times under identical conditions. This means that if you were to measure the same item or attribute several times with the same instrument and under the same environmental conditions, you would expect to get results that are very close to each other. The focus is on minimizing variations caused by the measurement process itself, ensuring that the results are reliable and consistent when the same method is applied repeatedly.

The other options relate to different aspects of measurement. While accuracy involves how close a measurement is to the true value, consistency across different conditions speaks to reliability in varied contexts, and variability in sampling addresses the acceptable range of variation when collecting data from a population. None of these definitions capture the essence of repeatability as effectively as the idea of producing consistent results under the same set of conditions.