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Interjections form a word class, the grammatical category traditionally known as 'parts of speech'. Of all the word classes, the interjection is the best described as a 'part of speech', as it is in essence something said. If it is written, it is always in less formal contexts seeking to mimic natural spoken language, such as intimate letters, fictional dialogue, and colloquial journalism. Sometimes labelled exclamation in traditional grammars, an interjection is the sort of utterance (sometimes less a 'word' than a sound) that may have little grammatical structure, nor any clear link in structure to other utterances: such cries as 'Ow!', 'ooh!' and 'ugh!'; comic strip balloons as 'Zap!', 'argh!' and 'bam!'; such profanities as 'Good God!', 'sod it!' and 'curses!'; and such expressions of feeling as 'alas!', 'phew!', 'mmmm!, 'tut tut!' and 'yuk'. Some short phrases may be used, as formulaic utterances, such as 'Well, I never [did]', 'Bless my soul!' and 'poor you!'.
- Etymological note: interjection comes from the Latin interjicēre 'to throw or cast between', a construction of inter- 'between' + i [or j] acēre (participle form interjectus) 'to throw'. There is also a verb in English 'to interject', meaning 'to interrupt', 'to break into', 'to make an interjection'.