(historical) The Thirteen Colonies that became the United States of America.

The official name of the United Kingdom 1801-1927 (before being renamed by the Royal and Parliamentary Titles Act 1927 following the creation of the Irish Free State in 1922).

(archaeology) A pit, trench, shovel test hole, (etc.) or other result of scientific excavation.

The flag of Great Britain or the United Kingdom. / (nautical, Britain) The flag flown on ships of the government of Great Britain or the United Kingdom.

plural of United Statesian

An Irish nationalist advocating a United Ireland.

A sovereign state that would cover the whole of the island of Ireland.

plural of union bug

(astronomy) The (otherwise unnamed) unit of density of electromagnetic radiation from a radio star, equal to 10⁻²⁶ watts per square meter per hertz

plural of unit matrix