† interˈfationObs.rare—0. [ad. L. interfātiōn-em, n. of action f.interfārī to interrupt in speaking, f.inter + fārī to speak.] (See quot.) 1656Blount Glossogr., Interfaction, an interrupting of one tale, a speaking whilst another speaks.1658Phillips, Interfaction[ed.1678Interfation].