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