01 n. The act of interjecting or throwing between; also, that which is interjected.
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1.
The act of interjecting or throwing between; also, that which is interjected.“The interjection of laughing.” — Bacon.
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2.
A word or form of speech thrown in to express emotion or feeling, as O! Alas! Ha ha! Begone! etc. Compare Exclamation.(Gram.) See: 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.