Fusion, marriage, combination.
A metal that is a combination of two or more elements, at least one of which is a metal.
An admixture; something added which stains, taints etc.
To impair or debase by mixture.
To mix or combine; often used of metals.
To reduce the purity of by mixing with a less valuable substance.
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.