In a manner that provides emotional or spiritual cleansing or purification.
From cathartical + -ly (adverb suffix), creating an archaic adverbial form. This follows the same Greek root katharos (pure) with multiple suffix layers.
Reading fiction cathartically—meaning we use it to emotionally purge—is actually why people's moods improve after finishing sad books; our brains literally process the emotions and then release them.
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