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The definition of union

Synonyms:	marriage, coalition, intercourse, integration, join, unite, unification, combination, merger, mixture, blend, merge, conjunction, fusion, synthesis, amalgamate, amalgam, amalgamation, alliance, league, association, federation, confederation, confederacy, Bundaberg, match, wedlock, matrimony, coupling, copulate, nooky (slang), coitus, rumpy-pumpy (slang)

From Collins