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1. General In Late Antiquity, the term “catechism” (Latin  catechismus from Greek  katéchesis, “oral instruction”) came into use for the instruction of adult catechumens; when infant baptism was introducted in the 2nd/3rd century, it was applied to the instruction of the faithful (Catechetics). In the early modern era, the term came to be applied to systematically organized works designed for elementary religious instruction. Other terms used included  ench( e) iridion (Greek, “small handbook”),  institutio (Latin, “instruction”), and  summa (Latin, “sum”). Catec…