Enantiomerically Pure Definition:

A solution that consists of a single enantiomer and not its mirror image is called enantiomerically pure.

Enantiomerically Pure Explained:

A sample that contains only a single enantiomer is enantiomerically pure.

For example, a solution containing d-tartaric acid. The specific rotation of d-tartaric acid is +12.7 ° and therefore the specific rotation of the solution is the same. Note: The specific rotation of its enantiomer is -12.7 °.