"Abecedarius" (or "abecedarium") is a Medieval Latin word meaning "ABC primer", derived by adding the suffix "-arius" (-a, -um) to the names of the first four letters of the alphabet (a+b+c+d).
This name is derived by adding the suffix "-arius" to the names of the first four letters of the alphabet (a, b, c, d), which also implies a connection to the concept of primers or introductory texts.