Black's Law Dictionary (2nd edition)dictionaries

Derogation

The partial repeal or abolishing of a law, as by a subsequent act which limits its scope or impairs lts utlllty and force. Dlstlngulshed from abrogation, which means the entire repeal and annul* ment of a law. Dlg. 50, 17, 102

Source: Black's Law Dictionary 2nd Ed (1910)