Magistrate
includes an additional magistrate and an assistant magistrate and, in relation to any particular act to be performed or power or right exercisable or duty to be carried out by the magistrate of a district, includes an additional magistrate or assistant magistrate permanently carrying out at any place other than the seat of magistracy of that district the functions of the magistrate of that district in respect of any portion of that district, whenever such act, power, right or duty has to be performed, exercised or carried out by virtue of any death occurring, thing being or deceased having resided or carried on business, as the case may be, in such portion of that district.