British spelling: the act or process of catechising; instructing someone in religious doctrine through systematic questioning and answers.
From 'catechise' + '-ation' suffix (indicating an action or process). The British '-ise' form combines with '-ation' to create this variant of the American 'catechization.'
Catechisation was literally the medieval and Renaissance version of standardized testing—if you could answer the catechism questions, you'd learned the material correctly.
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