Religious instruction or teaching, especially oral instruction in Christian doctrine or faith, often using a question-and-answer format.
From Greek 'katechesis,' literally 'teaching by word of mouth.' The root comes from 'kata-' (down/completely) and 'echein' (to sound), suggesting information being drummed repeatedly into someone's mind.
Catechesis is the ancient teaching method that worked so well they still use it today—the question-and-answer format makes your brain stick with information way better than just reading because you're actively engaging with it.
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