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Reference.org
Interjection
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<p>An interjection is a word or expression that occurs as an utterance on its own and expresses a spontaneous feeling, situation or reaction. It is a diverse category, with many different types, such as exclamations <i>(ouch!</i>, <i>wow!</i>), curses (<i>damn!</i>), greetings (<i>hey</i>, <i>bye</i>), response particles (<i>okay</i>, <i>oh!</i>, <i>m-hm</i>, <i><a href="/facts/Speech_disfluency/XbWx0YHF">huh?</a></i>), hesitation markers (<i>uh</i>, <i>er</i>, <i>um</i>), and other words (<i>stop</i>, <i>cool</i>). Due to its diverse nature, the category of interjections partly overlaps with a few other categories like <a href="/facts/Profanities/gf39KK4s">profanities</a>, <a href="/facts/Discourse_marker/qFm34J0p">discourse markers</a>, and <a href="/facts/Filler_(linguistics)/beH7uoH5">fillers</a>. The use and linguistic discussion of interjections can be traced historically through the Greek and Latin Modistae over many centuries. </p>