The word or phrase domicile refers to housing that someone is living in, or (law) the residence where you have your permanent home or principal establishment. A domicile certificate is an official document that acts as evidence of the permanent residence of a person in a state or Union Territory (UT) in India.1. a customary dwelling place; home; residence 2. Law one's fixed place of dwelling, where one intends to reside more or less permanently. Domicile is relevant to an individual's "personal law", which includes the law that governs a person's status and their property. Domicile state generally refers to the state where a candidate has their permanent residence or where they have spent a significant portion of their life.