An interjection is a word or expression that occurs as an utterance on its own and expresses a spontaneous feeling or reaction. It is a diverse category, encompassing a number of different parts of speech, such as exclamations (ouch!, wow!), curses (damn!), greetings (hey, bye), response particles (okay, oh!, m-hm, huh?), hesitation markers (uh, er, um) and other words (stop, cool). Due to its diverse nature, the category of interjections partly overlaps with a few other categories like profanities, discourse markers and fillers. The use and linguistic discussion of interjections can be traced historically through the Greek and Latin Modistae over many centuries.
An exclamation or filled pause; a word or phrase with no particular grammatical relation to a sentence, often an expression of emotion.
An interruption; something interjected
A loud calling or crying out, for example as in surprise, pain, grief, joy, anger, etc.
A word expressing outcry; an interjection
A clause type used to make an exclamatory statement: What a mess they made!; How stupid I was!
The sign “!” by which outcry or emphatic utterance is marked.