sameinuð

Sameinuð is an Icelandic adjective and past passive participle meaning "united" or "joined." It is formed from the verb sameina, to unite, with the participle suffix -ð. The term is used to describe things that have come together or have been unified, such as states, organizations, or groups.

In modern Icelandic, sameinuð is commonly used before a noun (attributive use) and can take various inflected forms to agree with gender, number, and definiteness. A well-known example is the phrase for the United Nations: Sameinuðu þjóðirnar, which shows how the word appears in a fixed, high-profile compound name.

Usage of sameinuð extends to references to mergers, coalitions, or federations, where unity or consolidation is a central idea. It is also found in historical and legal contexts when describing entities that have formed a single unit.

Related terms include sameina (to unite) and sameining (union or integration), which provide the verbal and nominal roots from which sameinuð is derived. The word is widely understood in Icelandic and remains common in official, academic, and media language when discussing united or merged entities.