adjective (a)

• relating to or expressed by a writing system that uses an alphabet(adj.pert)

  Example:
  Alphabetical writing system.
  

  Synonym:
  alphabetical
  

  source: wordnet30
• arranged in order according to the alphabet(adj.all)

  Example:
  An alphabetic arrangement.
  Dictionaries list words in alphabetical order.
  

  Antonym:
  analphabetic
  

  source: wordnet30
• Pertaining to, furnished with, expressed by, or in the order of, the letters of the alphabet; as, alphabetic characters, writing, languages, arrangement.(adjective)

  source: webster1913