Amalgamate is a formal verb meaning "to unite (two or more things) into one thing."

// The school district has proposed amalgamating the two high schools.

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"Ten years ago, there were 339 credit unions in Ireland, but that is down to 187, according to Central Bank figures. Part of the rationale for credit unions to amalgamate to create larger units is so they can expand their mortgage and business lending." — Charlie Weston, The Irish Independent, 28 Aug. 2025

Today, one can amalgamate—that is, combine into one—any two (or more) things, such as hip-hop and country music, for example. The origins of amalgamate, however, have more to do with heavy metal. Amalgamate comes from the Medieval Latin verb amalgamāre, meaning "to combine (a metal) with mercury." It’s been part of English since the 1500s, its introduction closely trailing that of the noun amalgam (from the Medieval Latin amalgama), which in its oldest use means "a mixture of mercury and another metal." (In dentistry, amalgams combining liquid mercury with powders containing silver, tin, and other metals are sometimes used for filling holes in teeth). The word amalgamate can be used either technically, implying the creation of an alloy of mercury, or more generally for the formation of any compound or combined entity.