obrŏgātĭo — Lewis & Short
obrŏgātĭo, ōnis, f.obrogo,
I 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.