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What is an Interjection?

interjection (noun): a part-of-speech that expresses emotion

An interjection is one of the 9 parts of speech.

An interjection is a short word or phrase that shows emotion. It often stands alone, unconnected to a sentence.

Typical interjections are:

And here are some interjections in context:

Interjections are not normally used in formal writing, but they are common in speech (and therefore informal and fiction writing), where they show emotions such as anger, surprise and interest as well as convey hesitation.

Interjections are frequently followed by an exclamation mark (!), which itself is used to express emotion.
See also this list of interjections with meanings and example sentences showing interjections in context.