The status of belonging to a particular nation by birth or naturalization WordNet 3.0 & Open English WordNet

Nationality is the status of belonging to a particular nation, defined as a group of people organized in one country, under one legal jurisdiction, or as a group of people who are united by a common culture, history, traditions, and awareness of a common origin. Wikipedia

A legal identification of a person in international law, establishing the person as a subject, a national, of a sovereign state Wikidata

The condition of a person who is a member of a particular nation. OmegaWiki

Membership of a particular nation or state, by origin, birth, naturalization, ownership, allegiance or otherwise. Wiktionary

Membership of a nation or state. Wiktionary (translation)