tending to diminish or disparage; "belittling comments"; "managed a deprecating smile at the compliment"; "deprecatory remarks about the book"; "a slighting remark"
(law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law; "any derogation of the common law is to be strictly construed"
the speech act of answering an attack on your assertions; "his refutation of the charges was short and persuasive"; "in defense he said the other man started it"