Emily Dickinson Lexicon

DER-O-GA'TION, n.

1. The act of annulling or revoking a law, or some part of it. More generally, the act of taking away or destroying the value or effect of any thing, or of limiting its extent, or of restraining its operation; as, an act of parliament is passed in derogation of the king's prerogative; we can not do any thing in derogation of the moral law.
2. The act of taking something from merit, reputation or honor; a lessening of value or estimation; detraction; disparagement; with from or of; as, I say not this in derogation of Virgil; let nothing be said in derogation from his merit.