Interject Definition

ĭntər-jĕkt

interjected, interjecting, interjects

verb

interjected, interjecting, interjects

To say or mention suddenly, often in interrupting the remarks of another.

“I disagree,” she interjected.

American Heritage

To throw in between; interrupt with; insert; interpose.

To interject a question.

Webster's New World

To assert (oneself) in a situation in which one has not previously been involved.

American Heritage

The definition of interject is to interrupt or butt into a conversation with a sudden or abrupt statement.

When you interrupt a conversation to insert your comment, this is an example of a time where you interject.

YourDictionary

Synonyms:

Origin of Interject

Latin intericere interiect- inter- inter- iacere to throw yē- in Indo-European roots

From American Heritage Dictionary of the English Language, 5th Edition
From Latin interiectus, perfect passive participle of intericiō (“place between”).

From Wiktionary