A nation is a human cultural and social community. In as much as most members never meet each other, yet feel a common bond, it may be considered an imagined community. One of the most influential doctrines in Western Europe and the Western hemisphere since the late eighteenth century is that all humans are divided into groups called nations. Nationhood is an ethical and philosophical doctrine and is the starting point for the ideology of nationalism; a nation is a form of self-defined cultural and social community. Members of a "nation" share a common identity, and usually a common origin, in the sense of history, ancestry, parentage or descent. A nation extends across generations, and includes the dead as full members. Past events are framed in this context: for example, by referring to "our soldiers" in conflicts which took place hundreds of years ago. More vaguely,

Though "nation" is also commonly used in informal discourse as a synonym for state or country, a nation is not identical to a state. The people of a nation-state consider themselves a nation, united in the political and legal structure of the State. While traditionally monocultural, a nation-state may also be multicultural in its self-definition. The term nation is often used as a synonym for ethnic group (sometimes "ethnos"), but although ethnicity is now one of the most important aspects of cultural or social identity, people with the same ethnic origin may live in different nation-states and be treated as members of separate nations for that reason. National identity is often disputed, down to the level of the individual.

Almost all nations are associated with a specific territory, the national homeland. Some live in a historical diaspora, that is, "scattered" or "sown" outside the national homeland. A state which explicitly identifies as the homeland of a particular nation is a nation-state, and most modern states fall into this category, although there may be violent disputes about their legitimacy. Where territory is disputed between nations, the claims may be based on theory called Urrecht, in which history is brought to bear to legitimise present occupancy: Phoenicianism and Zionism are two such historicised nation-building doctrines. National founding myths are etiological legends that when examined in historical contexts are found to answer quite specific issues, which generated them. Especially in Canada the term "First Nations" is used for groups which share an aboriginal culture, and have or seek official recognition or autonomy.

Ambiguity in usage

In regular usage, terms such as nations, country, land, and state often appear as near-synonyms, i.e., they can be used for a particular area or territory, or for the government itself; in other words, a de jure or de facto state.Fact: date=May 2008 In the English language, the terms do have precise meanings, but in daily speech and writing they are often used interchangeably, and are open to different interpretations.Fact: date=May 2008