As used in this act:
a. "Candidate" means any person who shall file, or cause to have filed, a petition of nomination for election, or for election, to any local elective office;
b. "Local elective office" means any office of a local unit regularly filled at an election by the voters, but does not mean any office established by the State Constitution;
c. "Local unit" means a county or municipality, and, whenever an office is required to be filled by election from a district, ward or other subdivision means the district, ward or subdivision to which the office pertains;
d. "Resident" means a person having, within the territorial limits of the local unit, a place of abode, which has not been adopted for any mere special or temporary purpose, but is his ordinary and permanent domicile.