Source : Webster's Revised Unabridged Dictionary (1913)

Abecedarian \A`be*ce*da"ri*an\, Abecedary \A`be*ce"da*ry\, a.
   Pertaining to, or formed by, the letters of the alphabet;
   alphabetic; hence, rudimentary.

   {Abecedarian psalms}, {hymns}, etc., compositions in which
      (like the 119th psalm in Hebrew) distinct portions or
      verses commence with successive letters of the alphabet.
      --Hook.