(set theory) One of the axioms in axiomatic set theory, equivalent to the statement that a union exists for any set, containing exactly all the elements contained within the sets within that set.

Official name for the Comoros.

plural of yellow union

A trade union that is dominated or influenced by an employer and thus not properly independent.

A place of employment in which newly hired workers must join the union representing the workers within a certain period of time, typically 30 days.

Former name of Tokelau.

(printing) A maker's mark imprinted on a work to show that it is sanctioned by members of a trade union. It is often a tiny elongated rhomboid containing and surrounded by, in minuscule typeface, identifying names and the union's local chapter number.

A legal union similar to marriage, established to allow same-sex couples (and, in some jurisdictions, opposite-sex couples) rights similar to those married couples have.

plural of union bug

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.