Precision can be defined as the

exact center of a data set.

reproducibility of a measured value.

correlation between two variables that are measured in a data set.

agreement between a measured value and an accepted value.

Precision can be defined as the

reproducibility of a measured value.

Precision is how close the measured values are to each others. In contrast with accuracy, accuracy is the agreement between a measured value and an accepted value. Accurate data are always precise while precise data is not always accurate.