Nationalism

n. patriotism, devotion to one's country; ambition for national progress

Nationalism is a term that refers to a doctrine or political movement that holds that a nation—usually defined in terms of ethnicity or culture—has the right to constitute an independent or autonomous political community based on a shared history and common destiny. Most nationalists believe the borders of the state should be congruent with the borders of the nation. Extreme forms of nationalism, such as those propagated by fascist movements in the twentieth century, hold that nationality is the most important aspect of one's identity and attempt to define the nation in terms of race or genetics.
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Noun
1. love of country and willingness to sacrifice for it
(synonym) patriotism
(hypernym) loyalty
(hyponym) Americanism
2. the doctrine that your national culture and interests are superior to any other
(antonym) multiculturalism
(hypernym) doctrine, philosophy, philosophical system, school of thought, ism
3. the aspiration for national independence felt by people under foreign domination
(hypernym) ambition, aspiration, dream
4. the doctrine that nations should act independently (rather than collectively) to attain their goals
(antonym) internationalism
(hypernym) doctrine, philosophy, philosophical system, school of thought, ism

(n.)
The state of being national; national attachment; nationality.
  

(n.)
National independence; the principles of the Nationalists.
  

(n.)
An idiom, trait, or character peculiar to any nation.
  

An ideology, or rather a whole category of similar ideologies, based on the premise that each nation (or at least the ideologist's own nation) constitutes a natural political community whose members should all live together under the authority of "their own" independent nation state. When the people of one nation live in large numbers in a multi-ethnic state or in states with government(s) dominated by political elites drawn from another nationality, nationalism often becomes an ideology justifying rebellion or secession in order to create or recreate a nation state for the heretofore subjugated nation. When substantial numbers of people seen as belonging to the nation live outside the borders of their own nation state, nationalism often becomes an ideology justifying an aggressive foreign policy striving to expand the state's borders to include them. Nationalist ideologies usually claim that their respective nation possess special national characteristics or virtues that make them morally and intellectually superior to all other nations and should qualify their nation state for a special or privileged role in the world at large.[See also: ideology, nation, state, nation state, fascism]