According to the Merriam-Webster Dictionary, an Abecedarian is "one learning the rudiments of something (as in the alphabet)".
According to the original Catholic Encyclopedia, the Abecedarians were a 16th-century German sect of Anabaptists who affected an absolute disdain for all human knowledge, contending that God would enlighten his elect from within themselves, giving them knowledge of necessary truths by visions and ecstasies, with which human learning would interfere.
They rejected every other means of instruction, and claimed that to be saved one must even be ignorant of the first letters of the alphabet; whence their name, A-B-C-darians. They also considered the study of theology as a species of idolatry, and regarded learned men who did any preaching as falsifiers of God's word.
John Bell stated their founder's name was Stork, a disciple of Luther, and that "this sect was some time considerable in Germany".
No equivalent entry was present in the New Catholic Encyclopedia. This usage of the term has been recorded elsewhere, such as in dictionary lists. Historical references later than the early 20th century do not mention these claims.