In`ter*jec"tion (?), n. [L. interjectio: cf. F. interjection. See Interject.]
1.
The act of interjecting or throwing between; also, that which is interjected.
The interjection of laughing.
Bacon.
2. 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.
Earle.
How now! interjections? Why, then, some be of laughing, as, ah, ha, he!
Shak.
© Webster 1913.