The quality or characteristic of using alliteration; the degree to which something contains repeated initial sounds in nearby words.
From 'alliteration' (Latin 'ad' + 'litera' meaning to/letter) plus '-ness' (quality of). Alliteration has been a literary device since ancient times, especially in English and Germanic poetry.
The alliterativeness of tongue-twisters like 'Peter Piper picked a peck of pickled peppers' is almost maddening—but this repetition creates memorable, rhythmic language that sticks in your brain forever!
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