A kingdom and sovereign state in Western Europe comprising the four countries of England, Scotland and Wales in the island of Great Britain, and Northern Ireland in the island of Ireland. Since 1922.

A country in North America, stretching from the Atlantic to the Pacific Ocean, and including Alaska, Hawaii, and several territories.

(in the singular, formerly also plural) Ellipsis of United States of America. / (in the plural) The collection of individual states of the United States of America.

(historical) A nation in Eurasia that existed from December 30, 1922 to December 26, 1991.

An international coalition, founded in 1945 and headquartered in New York City, that aims to promote global co-operation and maintain international order.

(mathematics) Oneness, singularity, seen as a component of a whole number; a magnitude of one. / (sciences) A standard measure of a quantity. / The number one. / Clipping of international unit.

For each unit. / (mathematics) Having a size or magnitude of one.

A supranational organisation, consisting of 27 member states, created in the 1950s to bring the nations of Europe into closer economic and political connection.

(countable) The act of uniting or joining two or more things into one. / (countable) The state of being united or joined; a state of unity or harmony.

To combine sets using the union operation.