When two or more things, especially organizations, amalgamate or are amalgamated, they become one large thing. The firm has amalgamated with an American company The chemical companies had amalgamated into a vast conglomerate The Visitors' Centre amalgamates the traditions of the Old World with the technology of the New. = merge + amalgamation amalgamations amal·gama·tion Athletics South Africa was formed by an amalgamation of two organisations. = merger