1. a dwelling place : place of residence : home 2. Law a : a person's fixed, permanent, and principal home for legal purposesYour domicile is the place where you reside and the place where you intend to return after temporary absences. Domicile refers to the place you call home permanently. Your domicile is important for legal purposes such as paying taxes, voting, and claiming benefits. An affidavit of domicile is a legal document used to establish a deceased person's primary residence at the time of their death. Domicile is a fancy word for the place where you live. Whether it's a mansion on 5th Avenue or a tee-pee in the desert, if you live in it, it's your domicile. The common question is, "What does domicile mean? An affidavit of domicile is a legal document that verifies the primary place of residency of someone after their death.