Dictionary.com gives us the following definition for interjection: “a word or words, or some noise, used to express surprise, dismay, pain or other feelings and emotions.”
“Oh dear, so that’s what an interjection is.Â I never realized.”
The “Oh dear” (or “Oh, dear”) part of the above sentence represents the [tag]interjection[/tag].
Interjections are probably safest when used in spoken English, and unless you wanted to beÂ sarcastic or sardonic, you probably wouldn’t use one in formal writing.Â I could be wrong, and there may be legitimate reasons to use interjections in formal writing.Â To wit:
“Stop!Â Read no further until you have completed the last step.”
Maybe that works.Â If you’re writing a manual about how to defuse a bomb.