Merriam-Webster Collegiate Dictionary - abecedarian

 I. noun  Etymology: Middle English abecedary, from Medieval Latin abecedarium alphabet, from Late Latin, neuter of abecedarius of the alphabet, from the letters a + b + c + d  Date: 1603 one learning the rudiments of something (as the alphabet)  II. adjective  Date: 1665  1.  a. of or relating to the alphabet  b. alphabetically arranged  2. rudimentary