Definition - What does Derogation mean?
The term derogation can be defined as the abrogation or partial repeal of law by an act that impairs its force and utility or limits its scope. Derogation is quite different than abrogation, which totally annuls the law.
Justipedia explains Derogation
Derogation can also simply be explained as reducing the stringency in any law or rule or making it non-applicable. This is usually practiced in specific cases and for a specific period of time. The term is commonly seen in common law, civil law, or canon law.