The Collaborative International Dictionary of English v.0.48:
Derogate \Der"o*gate\, v. t. [imp. & p. p. Derogated; p. pr. &
vb. n. Derogating.] [L. derogatus, p. p. of derogare to
derogate; de- + rogare to ask, to ask the people about a law.
1. To annul in part; to repeal partly; to restrict; to limit
the action of; -- said of a law.
By several contrary customs, . . . many of the civil
and canon laws are controlled and derogated. --Sir
2. To lessen; to detract from; to disparage; to depreciate;
-- said of a person or thing. [R.]
Anything . . . that should derogate, minish, or hurt
his glory and his name. --Sir T. More.