person without a registered or fixed address
Refers to someone who is not registered in any official family register or resident registry, often implying homelessness or lack of legal domicile.
People without a registered address have difficulty accessing public services.
Compound of 無籍 (むせき, 'unregistered') + 者 (もの, 'person'). The exact historical derivation is uncertain, but the term is used in legal and administrative contexts.