dērŏgātĭo, ōnis, f. [derogo],
a partial abrogation of a law, a derogation : tertium est (genus) de legum derogationibus, etc., Cic. Cornel. I. Frag. 11; Auct. Her. 2, 10, 15.
dērogātiō ōnis, f derogo, a partial abrogation, limitation (of a law). ...
An Elementary Latin Dictionary