1. An activity, process, or result of combining or uniting something: There has been an amalgamation of the two competing companies into one organization.
2. The mixing of mercury with another metal, or metals, to form an alloy: The jewelry manufacturer used an amalgamation of silver and stronger metals to create a design that was both durable and beautiful.
3. The process for the separation of metal from a base ore using such a chemical as mercury: The mine engineer explained that the amalgamation of gold was a complicated chemical process.