Lewis Short
prōductĭo (noun F) : id..
* A lengthening, prolonging (class.): productio temporis,Cic. Fin. 3, 14, 45: verbi,id. Top. 8, 36.
* A lengthening in pronunciation: ut aut contractione brevius fieret, aut productione longius,Cic. de Or. 3, 50, 196: voces aut productione aut correptione mutatae,Quint. 9, 3, 69; cf. id. 7, 9, 13.
Charlton T. Lewis, Charles Short, A Latin Dictionary