interjectĭo, ōnis, f. [interiacio], a throwing or placing between, insertion.
I In gen.: verborum, Auct. Her. 1, 6, 9.—
II In partic.
A In gram., an interjection , Quint. 1, 4, 19.—
B In rhet., a parenthesis, an interruption of the principal idea by the insertion of another: interjectio qua et oratores et historici frequentes utuntur, ut medio sermone aliquem inserant sensum, Quint. 8, 2, 15.