§1. Domicile is acquired by that residence within the territory of a certain parish or at least of a diocese, which either is joined with the intention of remaining there permanently unless called away or has been protracted for five complete years.
§2. Quasi-domicile is acquired by residence within the territory of a certain parish or at least of a diocese, which either is joined with the intention of remaining there for at least three months unless called away or has in fact been protracted for three months.
§3. A domicile or quasi-domicile within the territory of a parish is called parochial; within the territory of a diocese, even though not within a parish, diocesan.
Source: Code of Canon Law (Vatican.va)