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An interjection is a part of speech that usually has no grammatical connection to the rest of the sentence and simply expresses emotion on the part of the speaker, although most interjections have clear definitions. Filled pause such as uh, er, um, are also considered interjections. Interjections are generally uninflected function words and have sometimes been seen as sentence-words, since they can replace or be replaced by a whole sentence (they are holophrastic). Sometimes, however, interjections combine with other words to form sentences, but not with finite verbs.
Interjections are used when the speaker encounters events that cause these emotions — unexpectedly, painfully, surprisingly or in many other sudden ways. But several languages have interjections that cannot be related to emotions.
The word "interjection" literally means "thrown in between" from the Latin inter ("between") and iacere ("throw").
Conventions like Hello and Goodbye are interjections, as are exclamations like Cheers! and Hurray!. In fact, very often they are characterized by exclamation marks depending on the stress of the attitude or the force of the emotion they are expressing. Well can also be used as an interjection, for example when put at the beginning of a sentence. Much profanity (see also expletive) takes the form of interjections.
Some linguists consider the pro-sentences yes, no, amen and okay as interjections, since they have no syntactical connection with other words and rather work as sentences themselves.
Interjections can be phrases or even sentences, as well as words:
As I entered the room — Oh, my goodness! What I saw! — he was still standing there.
Expressions "Excuse me!", "Sorry!", and similar ones often serve as interjections.
More interjections can be found on the movie School House Rock: Grammar Rock in the song "Interjections!"
Several English interjections contain sounds that do not, or very rarely, exist in regular English phonological inventory. For example (pronunciation shown in IPA):