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A slogan or incantation said aloud to indicate or set in motion a magical spell or wondrous feat. "Shazzam!" exclaimed the powerful wizard, as a bolt of lightning shot from his fingertips. I summon the power of the mystics, of all things unseen. Shazzam!
exclam. Wow!; Would you believe? (An incantation used by the comic book character Captain Marvel.) And there was my ring—Shazzam!—right on the sidewalk! Shazzam! I passed the test!