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.