• WordNet 3.6
    • n interjection the action of interjecting or interposing an action or remark that interrupts
    • n interjection an abrupt emphatic exclamation expressing emotion
    • ***
Webster's Revised Unabridged Dictionary
    • Interjection (Gram) A word or form of speech thrown in to express emotion or feeling, as O! Alas! Ha ha! Begone! etc. Compare Exclamation. "An interjection implies a meaning which it would require a whole grammatical sentence to expound, and it may be regarded as the rudiment of such a sentence. But it is a confusion of thought to rank it among the parts of speech.""How now! interjections ? Why, then, some be of laughing, as, ah, ha, he!"
    • Interjection The act of interjecting or throwing between; also, that which is interjected. "The interjection of laughing."
    • ***
Century Dictionary and Cyclopedia
    • n interjection The act of throwing between; an interjecting.
    • n interjection The act of ejaculating, exclaiming, or forcibly uttering.
    • n interjection In grammar, an interjected or exclamatory word; a word thrown in between other words or expressions, but having no grammatical relation to them, or used independently, to indicate some access of emotion or passion, and commonly emphasized to the eye in writing by a mark of exclamation, as oh! ah! alas! hurrah! Interjections are regarded as constituting a part of speech by themselves, although they are properly no “part of speech,” but holophrastic utterances, originally more or less instinctive, though coming, like the rest of speech, to be used conventionally. Some interjections, however, are transformations or abbreviations of ordinary words, as alas, zounds, 'sdeath. gad. Abbreviated interjection
    • n interjection A manner or means of expressing emotion with the effect of an interjection.
    • ***
Chambers's Twentieth Century Dictionary
    • n Interjection a throwing between:
    • n Interjection (gram.) a word thrown in to express emotion
    • ***


Webster's Revised Unabridged Dictionary
L. interjectio,: cf. F. interjection,. See Interject
Chambers's Twentieth Century Dictionary
L. inter, between, jacĕre, to throw.


In literature:

Emma started to tell Willy what a lot of trouble they had been in when Grace interjected a remark that caused Elfreda to wonder.
"Grace Harlowe's Overland Riders in the Great North Woods" by Jessie Graham Flower
It lasted for almost two hours; he used a handphone to interject comments and explanations.
"A Slave is a Slave" by Henry Beam Piper
The puzzling thing about it is that it was clearly meant by Nature to be an interjection.
"Punch, or the London Charivari, May 27, 1914" by Various
Expletives are of all grades from simple interjections to the strongest profanity.
"Folkways" by William Graham Sumner
He was listening to his master mechanic, interjecting a word now and then at which his subordinate nodded eagerly.
"Still Jim" by Honoré Willsie Morrow
Interjections express some emotion of the mind as, Alas!
"A Week of Instruction and Amusement," by Mrs. Harley
For a short space there was silence in the office, broken only by the half-audible interjections of the reader.
"More Cargoes" by W. W. Jacobs
He remembered how prettily she had answered a simple interjection once before.
"The Prodigal Father" by J. Storer Clouston
Puffin was rather taken aback by the violence of these interjections; they dripped with angry sarcasm.
"Miss Mapp" by Edward Frederic Benson
An interjection commanding attention or possibly the cessation of any action.
"The Sailor's Word-Book" by William Henry Smyth

In poetry:

Conjunction press'd to join the crowd;
But Preposition swore,
Though Interjection sobb'd aloud,
That he would go before.
"Sir Hornbook" by Thomas Love Peacock
As an Anti-Socialist,
Mister Chairman, I insist - (If that gentleman who interjected recently
Will endeavour to restrain
His impatience, I'll explain.
I'd remind him we conduct these meetings decently).
"The Logic Of Anti-Sosh" by C J Dennis

In news:

Archie begins shouting at the draft-dodger , and it looks as though he is going to have the final word until his friend Pinky Peterson (Eugene Roche), a middle-aged man whose own son had been killed in Vietnam, interjects.
Science and scientific authority are often interjected into political discourse.
While Michael O'Malley was speaking about plans to sell property in South Side, John Crolley interjected, "You have been a pest and a scourge to that neighborhood for 25 years".
Candy Crowley stands by her Libya interjection.
You may recognize the campy Batman interjection that they threw up on screen when Adam West threw a punch, but you may not recognize this video.
However, I'm afraid I finally have to submit my own interjection, about some recent advice you offered.
Salomon interjects with a note of relief.
The Supreme Court today finally and substantially interjected itself into the war on terrorism with a series of rulings that limit the power of the President to wage that war without judicial oversight.
"We didn't plan jokes, we didn't look for any special comic timing" — at which point Macy interjected, with crackerjack timing, "Speak for yourself.".
The leadership of the Republican Party inappropriately interjected itself into nonpartisan races, the three races for the Davis District Board of Education.
This week, I've seen and heard enough stuff to give me some motivation to break out the column and interject my two cents into things.
What little storyline there is comes from his dialogue, but his interjections are frequently silly rather than funny, and often irrelevant.
White " raps " about the fun and merriment of Christmas, but also interjects some serious messages to youngsters about being kind to others, obeying their parents, and doing well in school.
Questionable and at times maddening officiating was on display at UFC Live 4 on Sunday in Pittsburgh, as two officials routinely interjected themselves into bouts.
More people are trying to interject their opinions into the decline of modern education.

In science:

But first we interject a comment on our designation of ¯h-orders to avoid confusion.
Higher time derivatives in effective equations of canonical quantum systems
But men, this is enchanting! -- let me interject, For me, another grand occurrence comes to play: The sun rotates around us every single day, And yet, the headstrong Galileo was correct.
Zeno meets modern science
We can interject here that an alternative calculation of the elastic contributions can be done directly, with no dispersion relations, simply using the photon-proton vertex given earlier (Eq. (38)), whether or not the intermediate proton is on-shell.
Two-Photon Physics in Hadronic Processes
Utterances types which do not correspond to one of the conventional sentence moods as described above typically consist of a (sequences of ) phrases (multiple PPs or multiple NPs), polite thanking and greeting utterances and typically short forms like confirmations, negations, interjections and exclamations.
A Machine Learning Approach to the Classification of Dialogue Utterances
The kind of utterances belonging to the CON type (negation markers also belong to this class), THA type, EXC type (which also contains exclamatives and interjections) and GRE type should be obvious.
A Machine Learning Approach to the Classification of Dialogue Utterances