Of, relating to, or belonging to a nation as an organized whole: a national anthem. Of or relating to nationality: their national origin. Characteristic of or peculiar to the people of a nation: a national trait. Of or maintained by the government of a nation: a national landmark. Being in the interest of one's own nation: Isolationism is a strictly national policy. Devoted to one's own nation or its interests; patriotic. A citizen of a particular nation. See Synonyms at citizen. A contest or tournament involving participants from all parts of a nation. Often used in the plural.