The Collaborative International Dictionary
Alliterativeness
Alliterative \Al*lit"er*a*tive\ (?; 277), a. Pertaining to, or characterized by, alliteration; as, alliterative poetry. -- Al*lit"er*a*tive*ly, adv. -- Al*lit"er*a*tive*ness, n.
Wiktionary
alliterativeness
n. The state or quality of being alliterative.