What is Abrogation?

Abrogation means the destruction of or annulling a former law, by an act of the legislative power, or by usage.
In the context of abrogation, a law is either abrogated, where it is totally annulled, or only derogated from, where only a part of the law is abrogated.
Express Abrogation is achieved through the enactment of new law either in general terms, as when a final clause abrogates or repeals all laws contrary to the provisions of the new one, or in particular terms, as when it abrogates certain preceding laws which are named.
Implied Abrogation arises when new law contains provisions which are positively contrary to the former laws, without expressly abrogating such laws, and also when the order of things for which the law has been made no longer exists, and hence the motive which have caused its enactment have ceased to operate.