Source : Webster's Revised Unabridged Dictionary (1913)

Alphabetize \Al"pha*bet*ize\, v. t.
   1. To arrange alphabetically; as, to alphabetize a list of
      words.

   2. To furnish with an alphabet.

Source : WordNet®

alphabetize
     v 1: arrange in alphabetical order; "Alphabetize the list" [syn:
          {alphabetise}]
     2: provide with an alphabet; "Cyril and Method alphabetized the
        Slavic languages"