Synonyms for Admixture (same or very similar meaning)
WordNet sense 1 (the state of impairing the quality or reducing the value of something):
alloy, alloyWordNet sense 2 (an additional ingredient that is added by mixing with the base):
intermixtureWordNet sense 3 (the act of mixing together):
mix, mixture, commixture, mixingFrom the ODE community, based on WordNetadd/edit