Enosis (Greek: Ένωσις, IPA: [ˈenosis], "union") is an irredentist ideology held by various Greek communities living outside Greece that calls for them and the regions that they inhabit to be incorporated into the Greek state. The idea is related to the Megali Idea, a concept of a Greek state that dominated Greek politics following the creation of modern Greece in 1830. The Megali Idea called for the establishment of a larger Greek state including the lands outside Greece that remained under foreign rule following the Greek War of Independence in the 1820s, but which nevertheless still had large Greek populations.

The most widely known example of enosis is the movement within Greek Cypriots for a union of Cyprus with Greece. The idea of enosis in British-ruled Cyprus became associated with the campaign for Cypriot self-determination, especially among the island's Greek Cypriot majority. However, many Turkish Cypriots opposed enosis without taksim, the partitioning of the island between Greek Cypriots and Turkish Cypriots. In 1960, the Republic of Cyprus was born, resulting in neither enosis nor taksim.

Around then, Cypriot intercommunal violence occurred in response to the different objectives, and the continuing desire for enosis resulted in the 1974 Cypriot coup d'état in an attempt to achieve it. It, however, prompted Turkey into launching the Turkish invasion of Cyprus, which led to partition and the current Cyprus dispute.

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