abecedarianEnglishOxford Dictionary of Englishabecedarian /ˌeɪbiːsiːˈdɛːriən / ▸ adjective 1 arranged alphabetically: in abecedarian sequence. 2 rudimentary; elementary: abecedarian technology. – ORIGIN early 17th century (as noun, in the sense ‘a person who is learning the alphabet or is engaged in elementary education’): from late Latin abecedarius ‘alphabetical’ (from the names of the letters a, b, c, d) + -an.