The noun nation has 4 senses (first 3 from tagged texts)
1. (376) state, nation, country, land, commonwealth, res publica, body politic -- (a politically organized body of people under a single government; "the state has elected a new president"; "African nations"; "students who had come to the nation's capitol"; "the country's largest manufacturer"; "an industrialized land")
2. (80) nation, land, country -- (the people who live in a nation or country; "a statement that sums up the nation's mood"; "the news was announced to the nation"; "the whole country worshipped him")
3. (4) nation -- (a federation of tribes (especially native American tribes); "the Shawnee nation")
4. Nation, Carry Nation, Carry Amelia Moore Nation -- (United States prohibitionist who raided saloons and destroyed bottles of liquor with a hatchet (1846-1911))