Nationality/ˌnæʃəˈnæləti/ Definition 1 of 3Pro Tip 1/3Not Race Nationality refers to political borders, not biological heritage or race. His nationality is Canadian, but his race is Asian. Pro Tip 2/3Legal Proof Nationality often requires legal documents like a passport as proof. To prove my nationality, I showed my passport. Pro Tip 3/3Change Is Possible One can change nationality through naturalization, marriage, or adoption. She changed her nationality to Italian after living there for ten years.