Lewis Short
obrŏgātĭo (noun F) : obrogo
* A motion partly to repeal or alter one law by another, an obrogation: cum duae leges inter se differunt, videndum est, num qua obrogatio aut derogatio sit,Auct. Her. 2, 10, 15; cf. obrogo.
Charlton T. Lewis, Charles Short, A Latin Dictionary