The conferring of an office by the proper ecclesiastical authority and in accordance with canonical legislation.
This is the only legitimate way of obtaining an ecclesiastical office, and is made by free appointment, nomination and investiture, election and postulation.
In English-speaking countries canonical provision is generally by free appointInent.
Two conditions are required: the fitness of the candidate, which is judged by the ecclesiastical superior, and that the office be vacant.
New Catholic Dictionary