A chief magician or supreme sorcerer; a grand magus or arch-magician.
From archi- (chief) + mage (magician), combining the superiority prefix with the word for a wise man or magician. Used in fantasy and historical contexts.
Fantasy authors borrowed this real historical term to create ranking systems for magical practitioners—Merlin or Dumbledore would be the 'archimage' in their world, the top of the magical hierarchy.
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