admixture

(noun) the state of impairing the quality or reducing the value of something. Synonyms: alloy.

(noun) an additional ingredient that is added by mixing with the base. Synonyms: intermixture. Examples: "The growing medium should be equal parts of sand and loam with an admixture of peat moss and cow manure." "A large intermixture of sand."

(noun) the act of mixing together. Synonyms: mix, commixture, mixture, intermixture, mixing. Examples: "Paste made by a mix of flour and water." "The mixing of sound channels in the recording studio."