interjection

noun

1. the act of interjecting
2. something interjected, as a word or phrase
3. Gram.
   1. an exclamation inserted into an utterance without grammatical connection to it (Ex.: ah! I declare!)
   2. any of a class of words used in this way (Ex.: ouch! well!)

Origin: ME interjeccioun < MFr interjection < L interjectio