Present participle of exorcize; the ongoing action of driving out an evil spirit.
From exorcize + -ing gerund/participle suffix. English adds -ing to show continuous action or a noun form of the verb.
Notice that when you add -ing to 'exorcize,' you keep the 'z' sound (not changing to 's'), which is different from words like 'size' → 'sizing'; this shows English verb-forms have subtle patterns that aren't always consistent.
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