{ } a. Pertaining to, or formed by, the letters of the alphabet; alphabetic; hence, rudimentary. [ 1913 Webster ]

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. [ 1913 Webster ]

n. A primer; the first principle or rudiment of anything. [ R. ] Fuller. [ 1913 Webster ]