Other forms: interjected, interjects, interjecting
To interject is to throw a short remark in while other people are talking. A sentence dropped sideways into the conversation.
The word is formal and it usually appears in reported speech, as in he interjected that the figures were wrong. What separates it from interrupt is size and manner, since interjecting adds something brief and interrupting takes the floor. The noun interjection has a grammatical sense too, naming words like oh, ouch and hey, which stand outside the sentence and simply express feeling.
1verbinterjectTo say something briefly while another person is speaking.
“May I interject one point here?”
To interject is to place between. Latin intericiō means exactly that, so an interjection goes into the gap rather than being added at the end.
Latin
interiectus
English, today
interject
Built from
From Latin interiectus, perfect passive participle of intericiō (“place between”).
Etymology from Wiktionary, CC BY-SA