ISO/IEC 5259

The degree to which the difference between samples in terms of the target data is adequate.

The degree to which a dataset (assuming that it is accurate, complete, consistent, current, etc.) is suitable for a given context.

The degree to which a dataset represents the population under study.

The degree to which the similarity between samples in terms of interested features is adequate.

The degree to which the latency between the time when a phenomenon occurs and the time when the data recorded for that phenomenon are available for use is adequate.