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Irredentism is any political or popular movement that seeks to claim or reclaim and occupy a land that the movement's members consider to be a "lost" (or "unredeemed") territory from their nation's past.
Many states formalize their irredentist claims by including them in their constitutional documents, or through other means of legal enshrinement. Such territorial claims are justified on the basis of real or imagined national notions of historic territorial, religious or ethnic affiliations. Irredentist policies may be advocated by
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An area that may be subjected to a potential claim is sometimes called an "irredenta"; but not all irredentas are necessarily involved in irredentism.
A common way to express a claim to adjacent territories on the grounds of historical or ethnic association is by using the adjective "Greater" as a prefix to the country name. This conveys the image of national territory at its maximum conceivable extent with the country "proper" at its core. The use of "Greater" does not always convey an irredentistic meaning.