Lewis Short
interfātĭo (noun F) : interfor
* A speaking between, an interrupting in speaking (syn. interpellatio): contra verba atque interfationem,Cic. Sest. 37, 79: expositiones brevi interfatione distinguere,Quint. 4, 2, 50 Spald. N. cr.
Charlton T. Lewis, Charles Short, A Latin Dictionary