Dumbledore Wikia info card says:
Title(s) ... Grand Sorcerer
This fact is mentioned, but nowhere is it referenced/cited.
Where in HP canon (books/interviews/pottermore) is the fact sourced from?
Was that on his Chocolate Frog card?
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The title was abbreviated in the book.
It was listed in the letter that Hogwarts sent to Harry regarding his acceptance, in Harry Potter and the Philosopher's Stone, CHAPTER FOUR: The Keeper of the Keys
HOGWARTS SCHOOL OF WITCHCRAFT AND WIZARDRY
Headmaster: Albus Dumbledore
(Order of Merlin, First Class, Grand Sorc., Chf. Warlock, Supreme Mugwump, International Confed. of Wizards)
Dear Mr Potter,
We are pleased to inform you that you have a place at Hogwarts School of Witchcraft and Wizardry. Please find enclosed a list of all necessary books and equipment....