Pronunciation: (in"tur-jek'shun), [key]
1. the act of interjecting.
2. something interjected, as a remark.
3. the utterance of a word or phrase expressive of emotion; the uttering of an exclamation.
a. any member of a class of words expressing emotion, distinguished in most languages by their use in grammatical isolation, as Hey! Oh! Ouch! Ugh!
b. any other word or expression so used, as Good grief! Indeed!
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.