Accio is a very ordinary Latin word. The classical pronunciation would have been AHK-ee-oh. Church Latin (which evolved largely in parallel with the pronunciation of Italian) would give AHX-ee-oh. Either would probably work fine.

Some languages which are descended from Latin, such as Italian, pronounce 'cc' as 'ch,' but this is almost certainly not correct. UPDATE: In the Book of Spells, Accio is pronounced "ACK-see-oh" References from the canon. Newt Sca

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