"begin with the same letter or sound," 1776 (implied in alliterated), back-formation from alliteration. Related: Alliterating.
Entries linking to alliterate
alliteration n.
1650s, "repetition of the same sound or letter at the beginning of words in close succession," from Modern Latin alliterationem (nominative alliteratio), noun of action from past-participle stem of alliterare "to begin with the same letter," from Latin ad "to" (see ad-) + littera (also litera) "letter, script" (see letter (n.1)). Related: Alliterational.