Catechism/ˈkætəkɪzəm/ Definition 1 of 3Pro Tip 1/3Religious Origin Catechism originated in religion, and it still holds strong ties to those roots. Catechism classes are common in Christian churches. Pro Tip 2/3Memorization Tool Catechism can be a memorization tool to learn faith basics. The students used the catechism to memorize the Ten Commandments. Pro Tip 3/3Question-Answer Format Catechism utilizes a question-and-answer format to promote interactive learning. Her catechism involved questions about religious symbols.