Source : Webster's Revised Unabridged Dictionary (1913)

Alphabetic \Al`pha*bet"ic\, Alphabetical \Al`pha*bet"ic*al\, a.
   [Cf. F. alphab['e]tique.]
   1. Pertaining to, furnished with, expressed by, or in the
      order of, the letters of the alphabet; as, alphabetic
      characters, writing, languages, arrangement.

   2. Literal. [Obs.] ``Alphabetical servility.'' --Milton.

Source : WordNet®

alphabetical
     adj 1: relating to or expressed by a writing system that uses an
            alphabet; "alphabetical writing system" [syn: {alphabetic}]
            [ant: {analphabetic}]
     2: arranged in order according to the alphabet; "an alphabetic
        arrangement"; "dictionaries list words in alphabetical
        order" [syn: {alphabetic}] [ant: {analphabetic}]