n.
The repetition of the same sounds or of the same kinds of sounds at the beginning of words or in stressed syllables, as in "on scrolls of silver snowy sentences" (Hart Crane). Modern alliteration is predominantly consonantal; certain literary traditions, such as Old English verse, also alliterate using vowel sounds.
[From AD- + Latin littera, letter.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.