mixtion
/ˈmɪkstʃ(ə)n/Now chiefly archaic and historical
noun
The action or process of mixing; the condition or fact of being or becoming mixed; an instance of this. In later use chiefly: the formation of chemical compounds.
Origin
Late Middle English; earliest use found in John Trevisa (c1342–?1402), translator. From Middle French mixtion, mixion process of mixing, a mixture and its etymon classical Latin mixtiōn-, mixtiō from mixtus + -iō.