Etymology
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admixture (n.)

c. 1600, "act of mingling," with -ure + admix (1530s), a back-formed verb from admixt "mingled" (early 15c.), a past-participle adjective from Latin admixtus "mixed with," past participle of admiscere "to add to by mingling, mix with," from ad "to" (see ad-) + miscere "to mix" (from PIE root *meik- "to mix"). In Middle English admixt was mistaken as the past participle of a (then) non-existent *admix. The earlier noun was admixtion (late 14c., from Latin admixionem).

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Definitions of admixture

admixture (n.)
the state of impairing the quality or reducing the value of something;
Synonyms: alloy
admixture (n.)
an additional ingredient that is added by mixing with the base;
the growing medium should be equal parts of sand and loam with an admixture of peat moss and cow manure
Synonyms: intermixture
admixture (n.)
the act of mixing together;
Synonyms: mix / commixture / mixture / intermixture / mixing
From wordnet.princeton.edu