An archaic past participle form of commix; mixed or blended together.
From commix, using the archaic -t ending for past participles (like 'burnt' or 'learnt'). This form reflects older English grammar patterns.
Commixt is basically Early Modern English—you'll find it in documents from the 1600s-1700s, and it's a reminder that English verb conjugations used to be much more varied and flexible than they are today.
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